I think you nailed that one on the head HJ. Many of the people stuck on this Side are here because of trauma or unfinished business, and just need guidance.I don't know if putting up shields is necessary based on the description personally. Sounds like her friend came to her after her death, but she suffered a tragic fate so her connection is going to have that energy. There was a reason for it, and I don't think it was negative, the reason that is. Life can be awful and protecting yourself is priority #1 especially if you are a vulnerable population.
Heart goes out to her and I think it is still possible for positivity to lift her up, and she may be coming for some guidance. Encourage her to find peace and give her the feelings of love and forgiveness. Encourage her to move on and not linger in the past. Even attempt to clear her of attachments if you feel it's possible.
But if you feel you need shields then shield it up!
I’m so sorry for your loss Xera.