Define Friend. Write it down, what it truly means to you. does his person have those qualities, have they treated you according to your definition of friend, if so fight for it, go and be direct and ask for her to be direct. However if you find your definition doesn't fit this person, now is the time to let go and understand not all people fit like puzzle pieces and should be together and this is how you explain it to your child too.
My definition of a friend: someone who if you called them in the middle of the night for help, they will help to the best of their capabilities. Someone you can call and laugh with, cry with. Someone you can not talk to for a few months and pick up right where you left off. Someone who you know that will tell you when you have something on your tooth or tell you that what your feeling at any given moment is valid. They'll give you a hug when you need it and a swift kick in the pants when you need it. They are the family you choose, but like family won't go away just cause today was a bad day.
You have to define a friend to yourself, but from what I see, she doesn't fit my own friend definition. I have some fabulous friends, not alot, but fabulous.
Good luck in helping your daughter understand about what friendship is and being okay with having someone either be or not be a friend. It is an education that will help her for her lifetime.