Go to the range and rent some guns. Take your time and let her pick whichever gun she's most comfortable with. And, definitely have her take a women's "introduction to firearms" class to get some good instruction. There are quite a few schools and instructors in the Sooner state you can choose from.
Whatever you do, don't pick the gun for her. It's a waste of her time and your money.
Whatever you do, don't pick the gun for her. It's a waste of her time and your money.