We've all been there to some degree or another. I still say that the high road is the best road though. What I mean by this is...
"I can not account for what your father or stepmother may have said to you. I did not hear it and can not comment on it. I can tell you, that I love you, that the fact that your father and I are divorced has nothing to do with you, that when you are older you will figure out things on your own and be able to make clearer judgements, that I am your mother, I will always be your mother and no one can ever change that, etc"
Those are just some examples of the sort of things I have said to my children over the years. The older they get the more they "get it". They now realize that in all the years they have not heard me bad-mouth their father, their stepmother, or the family of either. They have heard me promote their fathers' remarriage as a positive thing for them (when in my heart I did not feel it and still don't). They have heard the opposite from their father and their step-mother. When they were younger (and the youngest still) believes some of their line of crap. But as they have matured they have seen the truth. I kind of use the "give them enough rope" strategy. It is VERY long, and VERY hard to do. But my oldest has been living with me for some years now and even before he turned 18 told his dad he would not ever live with him again because of his ways and actions towards me. My daughter may still live there but now there are days she will call just to say "I love you mommy". Out of a 13 yr old I think that is tremendous. Even my youngest at only 8 comments on the fact that my husband and I treat all of them, my children and his, equally and fairly, while the same is not done in his father's home.
You might explain to your daughter that you are educating yourself so that you can be a better parent to her and a positive influence and that when circumstances permit you will try to move closer to her. (don't make a promise you might not be able to keep) I know your daughter will not "hear" any of this at first. Keep saying it. Calmly, lovingly and often. We deal with extreme PAS with my ss. It's hurtful but never respond with hurt.
I have responded to "you're not my mother!" with, "No, I am not your mother, I have never claimed to be your mother. You have a mother. You don't need me to take her place. However, I am your father's wife and I am his helpmate. That means helping him care for you as well. Loving you as much as I do the children I gave birth to. There is no reason that your mother, your father and I can't all love you and you can't love all of us." I've also heard "You're fat" I've explained that I am as I am supposed to be and that the world would be boring if we all looked alike.
Best of luck to you.
NoNicky
For God has not given a spirit of fear; but of power and of love and of a sound mind. 1 Peter 1:6