Our 8 month old puppy is terrified of children. How can we fix this? 10 pts.?

She is 8 month old rescue and we've owned her for 6 months now. She doesn't see many children except for on her walks or the dog park. She will run away like they were going to hurt her. She is NOT a biter at all but I think if one of those kids were to try to pet her she may flip out. Needless to say we always keep Sadie away from kids but I'm not certain that's the right way to go about it. However, I don't want a kid harmed either. She loves other dogs except for the small toy ones. We go for lots of walks and she goes to the groomer and pet stores with us. What can we try to help her. Thanks!