I came back to say that I think I would make two points to those professionals.
1) that the girl's mother needs to be notified, and the girl herself should be encouraged and informed about how to take care of herself, so that *she* can be proactive in her own grooming and life
2) that I want my child to be in a school where this sort of picking-on people is discouraged, where playground manners are taught and enforced, and that I want them to work with the class in general to reduce or eliminate this sort of thing.
(I'd also be encouraging my child to be the good bystander--the one who says, "Hey, that was sort of mean" or "it's not good manners to comment on people like that." Good bystanders don't have to fight big battles, or even become besties with the people who are being tormented. They just have to indicate their disapproval. Even small things can have an effect.)