maybe b/c she doesn't want to get their clothes wet when they go into the bathtub with her.
i have 3 daughters and the only time they take the clothes off their dolls is when they are taking them in the tub,pool, or putting a different outfit on them.
I wouldn't worry about it too much-before you know it, she'll be more intersted in boys than dolls-then it's time to worry (lol)
