I would get her checked as soon as possible. Maybe she has a UTI if it hurts when she wee's especially. My DD who is 3 has a thing for sticking things in her vagina like her fingers and a few other things I wont mention. It really worried me with her as it seems to be way more then normal but fortunately she has never had bleeding. She once told me when I told her to take her finger out of her vagina No because I like it
Oh crikey.. im not looking forward to that lol