I know this isn't the reply you wanted but honestly it's probably not such a big issue. Me and my siblings used to play at "slaves" quite frequently. We'd play games that involved forfeits and sometimes a possible forfeit was "you have to be my slave for the day". Basically it just meant bringing them food, doing their chores, carrying their stuff, etc. It *sounds* messed up when you put it into words but in reality it was no big deal, it was just a game. And, judging by some of the other comments, not a particularly unusual game. I agree that OP should ask their daughter about it to make sure that everything's okay and that it's just a game but I think it's more likely that you're making a mountain out of a molehill.

Well if he's African American then it's really bad

Woah, someone is clearly overreacting!

You need to have a serious talk with her. No one should be allowed to treat others in such a way; especially at a young age. Sorry to say but you're raising her wrong.

You wouldn't be if it was your kid or sibling.

I hope the little boy wasn't black.

Maybe you should teach her better...

You really need to teach your daughter some respect for other people

That's dominance right there. At least you won't have to worry about anyone pushing her around.

If the genders were reversed, the child would be called a "sexist pig". However, since the OP's child is a girl, she's simply a "cute little diva". Really, she's just a little bitch.