We had a huge fight on facebook?!?

It sounds like she could really use a friend. It hurt her the most to feel misunderstood. She didn't mean it, but she's too prideful to apologize. If shes depressed, it sounds like she was just lashing out. :( Don't stop being friends. Its times like this where she needs you the most. She doesn't hate you, she's just going through something. Try and push past all her crap to see how hurt she is inside. I wonder whats going on in her life that causes her to be so down....