Looking for advice as I set up all the boards in our family and our teenage daughter is now not the same "girl" that she was last season.
Oh god now let it be forever known I am the forum perv!
In all seriousness, I don't think the actual hip joints are much wider on a man vs a woman. Possibly 1/2" wider all other things being equal.
That said, is she riding the same gear as last year? Has she grown taller at all?
Main thing is with ANY binding adjustments is to take baby steps. Maybe leave the rest of her stance the same but widen it out 1/2" or so. I wouldn't go crazy. Reference stance width seems pretty close on most people/boards I've seen.