This may be the right time to have that talk.

Wouldn't even include any anger in it. Just have to let her know that this is how some people are, they hate you for no other reason than you look different ect.

I had that talk with mine years ago as well. Crazy because when they first notice that this is a thing it's devastating to them. Kids don't give a fuck about color at that age they just want to play. Damn adults start them off early. If anything at least you know what household they come from.