A., Curiosity is one thing, but the sexual undertones of her comments in the shower are not curiosity. And love does not equal touching your "boobies." So, her comments that "I just love you so much," does not seem to fit to me. This seems from something she's seen, heard, or experienced. They could be from TV, or how daddy treats his girlfriend if he has one, the radio, or any number of other places. You are doing the right thing in telling her that we each have private spaces. I would encourage you to ask a few questions here and there to see where this may stem from. Her acting out in other things also may be related if there is something she is uncomfortable about, and doesn't know how to tell you. Especially if this acting out isn't the normal for her before. Is she in school this year? Could you maybe talk with her teacher, and see if she seems just very into healthy physical touch, or any other thing that stands out to them? If you find there is nothing amiss, then stand your ground on keeping your private areas private, and if it's at all possible to communicate with your EX so that you both are on the same page for addressing it. But, if you find something that you feel is not right, then disciplining her for trying to communicate (when she may not even know how), will not help. You are her advocate at this point if you need to be. I sure hope that she just needs continued encouragement from you. You sound like you are really on the ball and in tune with her, so know your sensitivity will pay off for the better.
J.