Do PLEASE be certain to always be truthful about her bioparentage. It is very important for adopted kids to NOT ever be lied to or have the bioparentage of their acting parents misrepresented. The truth of who is or is not their BIOparent should never be "saved up" then sprung on them at some theoretical "when they are old enough to understand" moment in time. Kids CAN and do understand, when explained in age appropriate terms, when a person parenting them is not a biological parent. I can't emphasize this enough. If they always know, it is just a fact of life that they take for granted as part of their story. My daughter has known I am not her biological mom since before she could talk. It will never need to be "told" to her as it's just a fact of life, like her hair color, to her.