You also have to teach your child to stick up for herself. I've had any number of people (of various nationalities, much like your child) try to go ahead of me because they have one item, their nationality, etc. I always politely point out that the end of the queue is behind xxx - move.

Never had a problem, even with national ladies. But I am polite. Occasionally someone will say "I only have 1 item" to which I respond, "I've been waiting 20minutes, you can wait too."