Turns out she was never cleaning herself good or something idk but she had some infection that kept comin back but its all good now
It sounds like an infection of the vagina, like a yeast infection. She should be seen by a doctor.
obviously, it's probly not a habit, if she's doing that it is a sign of infection and she should go to the doctor, as young as she is, it could either be internal from the cause of a health issue, or she's had sexual contact with some one at that age would be molestation so please get your sister help, that is abnormal. For any child to have white chunks in that area. unless it's only toilet paper but it would not be on an every day basis i dont think, she needs help
Wish you the best
I love her and all but it so gross :/