That is so hurtful in so many ways; giving so much to someone and realizing it’s not been appreciated or returned. I wonder if it’s a relationship you want to pursue. It sounds like she may just be using you and incapable of giving back. Her needs are constant but she has no room for anyone else.
Has she ever been supportive and there for you? You’ve really helped her through some serious situations. It might be a good time to rethink whether she’s really a friend.
Take care of yourself!