No they don't know "more" than adults.
No she isn't learning anything. She isn't old enough to understand what any of these people are fighting about. It is wrong to expose your child to these types of things. She is being used and that is all.
To use and expose children to sin I think is an unforgivable thing or a sin being committed.... The Bible says somewhere in it that
if these little ones are taught to sin, then it would be best that the ones who have taught them such a thing, might just as well tie a talent around their necks, and to then sink themselves to the bottom of the ocean/sea. To look into the face of a small child whom is still yet innocent of this world, is to look straight into the face of God himself.
It's been a while, but I'm sure the verses can be looked up and found again. I think people are definitely playing with fire these days, because they are using the children now to advance their wicked ways in such a way now, that to have the little ones exposed from a young age to become knowledgeable of these things as if they are OK when in fact it is not OK, and shockingly the adults know this but don't care anymore.