When my 9 yr old daughter came home from school real upset, because kids at school can be so mean verbal, I told her the old saying. "Sticks and stones may break my bones, but names will never hurt me.", she replied - mommy that's not true, those words really hurt my feelings. What do you say to that?
She's right, for one. Words can and do hurt. Instead of repeating some witty saying, ask her why those things hurt, and try to reassure her; it's unlikely that anything the other children said were actually true. Maybe explain to her that other kids can sometimes be mean. You don't have to go into detailed psychology, but explaining that sometimes people do things for strange (and selfish) reasons might help.
With that said, however, you know your daughter better than anyone. My advice may not apply to her maturity level.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them