I have a very dear friend who is similar.. he doesn't know from day to day if we are "friends on" or "friends off". He has been my BFF for 6 years. He has learned only in the last year or so that when I do "friends off" and push him as far from me as possible, that I will eventually come back around and he needs to be patient. He reassures me at the onset that he will be always be there for me, and then he quietly lets me "be". Throughout those days when I am at my worst, he doesn't hound or pester me, he lets me know he is there and cares about me and most importantly, will never leave. (I have a couple of issues And then when I am ready, I contact him and we are good. He doesn't take it personally anymore, and he used to. He knows it's not about him, its sadly about me and the thoughts swirling through my head. I will eventually be back.

I'm not sure if she is like that at all, but I thought I would share my own experiences. It really isn't uncommon and the best thing you can do is learn and understand. Alot of great books out there on coping strategies (I just got 4 of them).