What should I do being falsely accused of child abuse

My boyfriend and I live together he has a 2 YEAR OLD SON who we get every other weekend. The mother of the little boy said that the little boy claims I hit him which I have never laid a hand on the child. The mother says the boy had bruise on his back when child services went to check him out he had a bruise the size of a pinky nail on his back. I never hit the child I have a court appointed lawyer who says I have Nothing to worry about. Can I counter sue for false allegations and slander? Also I have proof to were the mother has said that her son does not need his father in his life . Can I take that to court as evidence that she is just trying to claim false charges? What's the worst that could happen if it was ruled in her favor even though I have never abused the child

If you have done nothing, then you don't need to get worried about it. Everything would be fine, she might want to harass you only!