Like any unwelcome behaviour I think it would be best to ignore it and try and distract her by getting her interested in something else when she starts acting this way. Like a book or a toy.

My boys are fascinated by my body and as you know with a little one you have no privacy. As soon as they hear the shower start up they are in there. They have been asking me recently where is my doodle?
A different situation I know but if I make a big deal about it I know they will ask all the time, so I have just told them quietly that I don't have one and they seem to accept that for now.

Have you read toddler taming? It is great for tips on stuff like this.