J.
Maybe have her assessed by a pediatric plastic surgeon? My son also had it and we didn't know enough to intervene in time. We were told to wait until his adult teeth come in and then assess how his jaw shape ends up looking. The head thing made his facial features asymmetrical, but they told us there was really nothing they could do until later - but I'm sure every child is different.
I don't feel like this posting is very helpful! If it's any help at all, I've noticed some kind of a pediatric orthodonist/plastic surgeon practice that advertises in Chicago Parent. I don't have a Chicago Parent handy and can't remember the name, but I know that I've made a mental note that they might be a place to consult eventually. They usually run a half-page ad. Something like that seems like a starting point, - dentists are only concerned with the teeth, but you would want someone also concerned with the whole shape of the face to look at it, I would think. Good luck! I hope you have a chance to update on what you learn.