So I caught my younger sister doin stuff with her teddy bear. I took a snapshot of her. I really don't know how to react. Maybe, being her elder brother, I should tell her to stay away from these kind of stuffs. I am really confused, what should I do. I cant bring myself and tell mom and dad about all this. If I do this, my sister would be highly embarrassed. I cant do this to my sister, I cant see her feeling embarrassed. What should I do?
Is it normal for a 14 y/o girl to do all this kind of things? If yes, then should I ignore it?
Please help me. Ima really stuck at this situation.
Advice? Tips?

PS - She doesn't know that I saw her. ​