C.D.
My sister tried to tell her son they were for mommy's ouchie. A couple days later he fell down. Next thing you know he is walking out of the bathroom with a pad on his forehead and a tampon in his ear for his "ouchies"!
I think giving her very simple basic answers might be a better idea! She probably just wants a basic yes or no to can she have them and a reason why. So, you could just say, "No honey, they don't make these for little girls." Then offer to paint her nails or something else pretty and girly and she will probably forget about it.
Good luck! :)