Hmm... has she refused contact? What sorts of wrong accusations? Complete fabrications or what could be possibly 'true' from her point of view, you just haven't been aware of it?
Sometimes people can do something that may have hurt other people without meaning to... If it was something you might have done without realizing it, it might be enough to say 'I'm sorry'?
If it's something completely fabricated and untrue, then you have my sympathies... ((hugz))

Parenting is an incredibly difficult job and I admire all who do it. You never know how the kids are going to turn out... You probably did your best according to then-knowledge and capabilities...