Gosh, I think you are going to be a really good coach!
As I understand it, having M.E. means she has had some damage to her nerves and swelling in her brain. This can cause a real feeling of rage or inability to cope and she can even be in a lot of pain and not really know it.
Best thing for you to do is to give her the space to work through it and then bring her back into the group as soon as you can. Pressuring her to "get a grip" won't help much, not taking it personally and not letting the other girls make fun of her is important. As time goes by, she will probably learn how to manage her problem better. I am sure you will help her do that.
Co-Moderator Lyme Disease Forum