When I was younger, I had baby teeth pulled due to over crowding, my parents couldn't afford braces, so they pulled baby teeth, and one permanent tooth. My front teeth look great, but my bite in the back is off. I was around 10 or so when they pulled the permanent tooth, probably 8 or 9 when they did a couple of baby teeth.
My son saw the ortho on Tuesday, and the doctor said that he only pulls permanent teeth as a very last resort after doing the expander and a retainer. My son is 8 though, so I am not sure if age makes a difference, maybe she's too old for the expander?