My deepest and sincere sympathies on the loss of your friend. I have a friend who lost her sister in the early 80's with ME/CFS was an all out epidemic in Europe and the U.S.
No one believed her, except my friend. She was furious and she and I met in 2006 and she was talking about her loss with her mom and I did something I never did before; admit that I had it. They instantly wanted to know everything I knew about it. I felt for the first time since contracting this, that I could be helpful to someone else. Bless you for befriending this woman and bringing joy into her life.