I would submit that kids, even eleven-year-olds, who've never seen a particular type of person before are likely to say stupid things. I can't judge whether she was actually hostile, though I certainly hope she wasn't. I just remember a really awkward, inarticulate period as a kid, where I'd say something really dumb-assed and it didn't accurately represent my attitude at all.

I hope it did open her mind, though you sometimes can't tell until years later.