Well one suggestion I have is maybe to back off from the whole situation for a few and let things cool off. One thing is you'll be able to approach the situation more calmly on both sides. Another thing is, if you've been friends for awhile, it will give her time to reflect on what she'd really be missing if you stopped being friends.

I don't know the whole situation still but she sounds very frustrated but I don't think friendships are so easily broken if you've been close before, I'm guessing it's just soemthing you're going through. give her time and space maybe?