That must be very difficult to deal with. I don't know anyone personally with it but I have heard how difficult it is to deal with through others. Try to keep your chin up and you will make more friends, maybe even better ones.
Oh I know what your going through is a difficult thing. I've learned a lot about bi-polar disorder through my work this past year. I've had several bi-polar clients. Each ones case is different too. From that I know how difficult it can be, how much it impacts you. If I hadn't gotten into this line of work, I'd never have had a clue.
I guess some people just aren't strong enough or know how to care enough. If she was really a good friend, she would have tried to find out more about your disorder. She should know that when you have your 'down times' it's not really you. Like has been said before, we know you are a wonderful, vibrant and caring person. Don't you forget that! i'll be praying extra for you too!
Sorry to hear about what happened. It sounds like your friend is having some problems. Probably she is pretty depressed right now and that's why she isolated herself. It's hard to know what to do. It's hard to show you care when someone tells you to go away. I guess probably the best thing is to give her some space, but be there for her should she need your help.