The way I see it is whats done is done. You bought her so now all you can do is love her and give her the best home possible (which im sure you are) I can understand where your concern and curiosity comes in when trying to find her background but if she if from a puppymill that will be quite hard to do. Max was from a petshop and I, like you tried to find out where he came from. was a long process and you know what I found out...nothing. just enjoy her