right now she is too young to understand any of it at all. it would only confuse her. I would wait til she is older since her bio dad doesn't want anything to do with her. my grandson recently found out that his dad is not his bio dad. my gson is 11. I think he still doesn't really understand but more age appropriate I think. he was told when he was about 4 or 5 but has no memory of that. he did not understand it then.