D.K.
I think the stuff about nail polish is fooy, I mean I probably chewed off more polish in my early teens and never got big boobies because of it, hee hee.
Most kid stuff is non toxic. Go to Toys R US or even Target. I know my daughter loves to play with that stuff too and I was a worried parent big time. I just make sure it states non toxic and from a company that I am familiar with. Disney has some great stuff for girls to play with too.
I polish my almost seven year old with regular polish as she doesn't chew on her nails anymore, but when she was younger they had wash off pretend polish.