Hello Tom.
I know this is perhaps a bit late, but please allow me a thought or two concerning your dream and your questions.
As usual, you may find my perspectives on everything in paranormal are a bit different from most members here since I come from another cultural background; alternative perspectives for you to take into account, if you will.
As to your dream, I have to ask you this first; were you in the middle of trying to achieve something you thought to be important when you had this dream, and you were having the feeling that something terrible or wrong might happen if you couldn't achieve it? And at the same time you were having a deadline to achieve your goal approaching, maybe?
If your answer is yes, the dream could be the manifestation of your fear or anxiety of not being able to achieve your goal in time.
You see, in that dream you were on the stairs. Every stairs would lead you upwards, on other words, to the 'peak of your achievement'. There's a phrase 'to reach the stars', and the stars are above there, you'd need stairs or ladder in order to 'reach' them.
The bald old scary guy is the representation of the deadline chasing you off.
As to you tried to call for your father for help, it could mean either your father was a very capable and reliable person to you and you knew he was the only one who can help you out of your situation of at the time, or he has something to do with you trying to achieve that goal in the first place (maybe he presented you with a challenge or something similar?).
Now, as to the young lady you saw floating next to your bed when you woke up from that dream, are you sure you weren't dreaming as well? I mean, there's this thing called 'to have a dream in a dream'-for example like, you woke up from that stairs dream and saw the young lady floating next to your bed, only to wake up the second time-and you woke up for real this time.
If you're sure you were not dreaming, and you're sure the young lady was really there, and you didn't feel a threat from her, then yes, maybe she's your guardian spirit. Maybe she was there in order to wake you up before the dream was getting worse and affecting you too much. That's why you felt so calm after you woke up and seeing her.
But even if she's your guardian spirit, I don't see the importance for you to really seek her out. Yes, there're ways to summon them out, and I know a way or two, but I won't tell you. Just let them be.
Now, maybe you'll ask me why should you let them be, because if she's your guardian spirit, you'd certainly have the right to get to know her, right? Well, it's not like I'm entirely against it but...
Indeed, you have the right to summon them out, but at the same time, if she has never made anymore appearance to you after you saw it back then, no you have not. That's because you can't see them (for most of the times) for a reason. If they have something to show or tell you, they'll just do it their own way and you don't have to summon them. It's just the same with 'getting to know them' matter, if the time ever comes to you to get to know them for a reason, they'll just come to you by themselves.
Every people indeed has their own right to think that each and everyone of us would have at least one guardian spirit. And to be honest, I believe it myself as well, that each and everyone of us, would have at least one guardian spirit. There're even more than one of them for every person if I may say.
I'm a Sundanese Indonesian, and in my native spirituality, it has been acknowledged that every person would have at least 4 guardian spirits in form of their twins (that's your 4 twins, which means, no female twins for you if you're a male, and no male twins for you if you're a female), each of them would stand guard to your West, East, North, and South (4 major directions), and yourself as the 5th soul, would be the central of this defensive formation (that means, how well the 4 twins perform their duty of guarding you against threats that are coming from 4 major directions would be affected by your own consciousness and awareness). Unlike the other type of guardian spirits, these 4 twins will always stay by your side at all time.
Then, there're guardian spirits of your family such as your ancestors or departed family members, or other paranormal entities of which either came to your family's side by their own accounts-or have been defeated by some of your family members in some ways. These ancestors and spiritual beings could also bring their entire groups in times of need to your aid (that said, your guardian spirit can also come to my aid if your guardian spirit is also a member of one of my guardian spirits' groups, and vice versa), so their total numbers can be differ from one person to another-from but a few to (literally) a whole bunch of them at different time.
From here, we can see that guardian spirits can be very busy with their job of protecting people or granting people's wishes (well, it's not literally like what you've been seeing from movies-but they're 'granting' wishes as well, in their own way), and in order for you to see them you'd have to summon them.
If you summon them with a proper way (with a proper way means they couldn't refuse the summon) as you like and they happened to be in their crucial moment of helping somebody in somewhere else, it could be fatal, as they'll have to all of a sudden leave that person alone..
Trying to summon one of your twins can also be fatal if they're in the middle of fighting threats as your summon might distract them. In this case, you'd be in danger yourself, as your twins' specialty is to fight direct threats to yourself.
In short, your summon may fail them in their duties, and here is by any means, you just don't have any right to do so.
Also don't be easily tempted by physical appearance alone, as guardian spirits are counted among the positive entities rank and they'd never tried to seduce you with physical appearance. Those who liked to seduce you with physical appearance are mostly succubus and incubus in your culture.
And that'd be the reasons why you'd be better off leave them be with their duties instead of summoning them only to satisfy your curiosity alone. You don't have to worry, however, as they have their own judgement over situations and they'll prioritize you when the need arises. Or, they'll always leave a replacement or two from their group behind if they had to leave your side for a moment.
You don't have to see them, acknowledging them is enough since it's also a part of your consciousness and awareness.
Also, thanking them by saying your gratitude once in a while is more than welcome (again, you don't have to summon them in order to do so, just address them; addressing without the intention of calling them out won't be considered as summoning in this case). It's also a good way of strenghttening your bond with them, and if your bond is strong enough, maybe you'll get your chance to get to know them, who knows? Just, don't put your hope too high on this. Don't be obsessed with it.
Well, those might've sounded strange or even funny to you, but that's from my native spirituality's perspective side, and also from some explanations I've gathered from my own guardian spirits (no, I didn't summon them just to give me that explanation, they came with their own account to do so).
And of course, I don't ask you to believe me since it's entirely up to you by all means, I'm just saying what I know, still... I hope this helps