it doesn't matter, she's going to fall in love with her father in both cases as much as she needs to understand that human body is not something to hide or be ashamed of.
i'm not saying the father should walk naked, but he can walk around in his underwear so that she understands. she's going to be curious anyway and will find a way to "sneak a peek"...
we were all children at some point and we all know that we were curious.