Fear of children

My 1.5 yr old female spayed JRT, Turbo, is very uncomfortable with children. She normally has a wonderful temperament (both her vet and our trainer have complemented me on how friendly and nonaggressive she is) and is even submissive with other dogs.

I am a college student living in a college town, and therefore we rarely see children, even at the park, and I don't know anyone who has children. I suspect my dog is scared of kids because she hasn't really been exposed to them. I got Turbo at 8 weeks from a breeder without children, so I don't think it is possible that any negative experience with kids could have happened.

Yesterday a 10 yr old girl (rough guess) approached me while I was walking Turbo and asked if she could pet her (bless her parents for teaching her to ask first!). The girl was very calm and non-threatening, but even when I had her squat down and avert her eyes so that she wasn't sending any type of aggressive signals with her body language, Turbo was still pulling on the leash to get away. Had this been an adult, Turbo would have been running up to investigate the wonderful new friend! This is not the first time Turbo has shown a desire to avoid children. She never growls or barks, or otherwise acts aggressive in these situations, just simply tries to run away.

Any suggestions on how to acclimate Turbo to children? Since I don't know any and even in public (like at parks and the pet store), I don't think most parents would go for their children petting dogs who are afraid of kids, I am at a loss for how to get Turbo to realize that children are just as friendly and nice as adults.