From what you have shared it sounds like you gave a lot of your time to this woman and invested a lot of efforts when it came to being there to fill her needs. Sadly, some times a person can get so they feel entitled and that is what they begin to expect from the relationship and can be a person that doesn't consider all you have done, but what you are providing them "right now". And when you can't do something "now" unfortunately some people base the entire quality of the relationship on that which is what this woman did with you when she said you are a bad friend. Yes, that can hurt because you know you gave her a lot. IMHO, her behavior is really saying that "she" is the one that is a bad friend and this is the kind of friend that is better to cut loose from.