Neal, Beartooth makes a comb raising kit for $20. It's a neoprene sleeve with foam inserts. She can keep her head on the stock and use a red dot. I use it on my Super Bantam with a Trijicon Reflex. This is my gun, not a kids.
A diy comb raising "kit" is slit pipe insulation halves stacked on top of the comb and secured with electrical tape.