I just can't let it go! I don't know what to do it's eating me up inside.

To start without going into a hughe long story that is hard to follow I will just give some of the basic info so you can follow. When I was younger I had a daugther when me and her dad broke up he meet another woman well they decided to get custody of her and somehow they won well I felt like I was in a place in life back then I was back into a corner and I stupidly signed adoption papers for her step mother to adpot her. I wished to God everyday I never had done that I didnt know back then that I could have went to court and fought it and it's too late now too many years had went by. Well anyway yesterday I had a phone call from her dad and it ended up in an agrument well today she calls me and basically says she wants nothing to do with me she was so mean and rude to me she was an absoulute smare ellec. This happened this afternoon every since then I have been so torn up by it I've been crying almost the whole time I couldnt even eat dinner. I told her I was sorry and she is not accepting what do I do I have asked for forgiveness from her and she wont take it. I just don't know what to do this is the first time she's ever acted this way with me. I just can't let go of it. I don't want this to hinder my relationship with God I know He can do mircales but this just seems so hopeless I just can't forget the horrible things she said to me. What do you do when someone says they want nothing to do with you and wont forgive you I just don't know what to do when she said these things to me eariler I felt like part of me died on the inside. Somebody help I don't know what to do.