Thanks ryanh for understanding. I wish I could dismiss it until later. It's not that easy. She excites herself in the car and other places as well, like watching a movie or just in her bed. If I never saw it, I obviously wouldn't care. But I can't just ask her to do it in private, because that would give her permission to do it.
Cassiopeia, I could tell you how I know she's doing it, but I feel it is too graphic to be shared. But, being one who masturbated at a young age, I know what she's doing. I know children touch themselves and such, but this is more than just touching and exploring. I can't ignore it when she's doing it right in front of me. I don't want to make her feel guilty about it, but I don't want to see it either. Also, I am a little worried about it happening at school.