Karma

[Coordinate_Apotheosis]

My best friend (former gf) who is indeed a wanderer and the purest soul I know asks me what might be the reason for her illnesses (epilepsy and MS) and the intense pain in her left eye caused by MS... and when she asks me about it, I always fail to come up with a respond relating to karma and the lessons she has to learn.

I can understand wanting to give someone like that answers.  I stress that I don't know, and am purely speculating, but it could be anything from learning how to handle pain and still be loving as a normal soul lesson, or can be akin to a 'limitation' that she is undertaking to help learn as a soul a different way to be...
Or she could just have them as severe distortions of being a Wanderer, though MS is pretty severe so I think it might be leaning more towards a lesson of planning how to handle pain.

But there are just speculations, I wouldn't share them with her, but rather I think I'll just recommend you getting the book Journey of Souls, and the one after it, Destiny of Souls, as they might help provide some way of providing some push to make her contemplate on her own why she has such illnesses and how she might learn to better love and forgive herself, and others in turn.

I admire your want to be of service to her, I feel a bit infringing suggesting these, but I think you'll know how to go about trying to help her.