why don't you go to a local board shop so she can try some on? Also, it's more important that she is fitted to the right size binding than it is to worry how "goliath" a binding is going to look.
My wife is a size 8 and rides the standard no problem.
I just meant she doesnt want to have seemingly tiny feet in a huge binding, not so concerned with the looks, shes just concerned that her feet will be too small i guess