M&P or HK P30 would be good choices. Both weapons have changeable backstraps and in the case of the HK, changeable side straps too. Someone with large hands can shoot a handgun with a small grip, but the reverse is not necessarily true.
Ultimately however she must be the one to pick what fits her hand.
The more prohibitions you have, the less virtuous people will be.
The more subsidies you have, the less self reliant people will be.
-Lao-Tzu, Tau Te Ching. 479 BCE
The 1911 may have been in wars for 100 years, but Masetro Bartolomeo Beretta was arming the world 400 years before John Browning was ever a wet dream.