Dear A.,
No, it is not that he taught her to be cold and ignore him, it is because she is deeply hurt by his meanness, and you know that it is just that. How can anyone be so cruel to a small child? I am not saying that so you will try to change him or get him 'back'. She will take care of that in the course of her life.
An eight year old child, particularly a girl is very sensitive and is trying to understand the world with as much mind as her body has developed so far. They say that we are still maturing mentally until about 21 years old. So she is at the beginning of trying to see how she should respond to people. I am glad that this has not bothered her relationship with her friends. Friends are of great importance to us all, from babies to older people unto death.
Stay beside her, give her your love and support, do not fuss at her, try to do things with her that will teach her how to be a woman, like cooking and getting ready for the next day, don't we all do that? I still do, and am way beyond having to go to work. Teach her how to be a mother and caregiver. You know what you want her to be like when she is an adult. Do not push her, just ask her to help you do things, and show her how to do small things building up to 'fixing dinner' or something like that. She will really get into it. Be sure to praise her, and go places with her, just like you would a friend. She will love that. You are her best friend, her hero, her beloved, and no matter what she says or does now or in the future, if you respond to her confidence that she already feels for you, it will make a much better life for her and for you.
When you spend time with her she will eventually start being more open with you and tell you what is bothering her.
Little girls do love Dads, My sister and I still talk about our father and call him "Daddy" he has been gone since we were 20 and we are now in our middle 70's. So that will show you how important they are in our lives. She is hurting and puzzled. Good Luck.
Sincerely, C. N.