Trying out thinner grips and short-reach triggers helped my kid a lot before we committed to a new gun, so borrowing different setups can save some headaches. I also messed around with training pistols from https://www.bespokeairsoft.co.uk/ to let her practice grip and transitions without recoil...
I'd look for pistols with very slim grips, short trigger reach, and adjustable backstraps. Let her test a few to see what she can run comfortably and safely.