I think you should ask her why she is doing it, she could be upset by something, have there been any changes in her life , a move, new school does she do okay at school , no bullying.Does she do this at school or just at home ?
I would definitely take her to a doctor, I really do not know why this is happening.
Sorry I was thinking I was on a blog! No, I cannot think why this is happening to your daughter
please take her to the Doctor.
When I was 11 yrs old I told my Mother I was pooing myself when in fact I had just started my periods.