Start EVERY new shooter off with .22's.
There is so much involved -stance, grip, sights, aim, trigger pull, safety & gun parts & how they function.... mag., loading mag., mag release, slide, slide lock, hammers, safety switches....
A newbie doesn't need the distraction of the boom & recoil. Or the discouragement they get when not being very accurate with a larger caliber they aren't ready for.
Always great to go back & forth to .22 once they start shooting other calibers - especially if any problems develope (like flinching or trigger yanking).
We women can learn to shoot anything - but picking a personal firearm to purchase starts with FIT, then purpose, then caliber.
She has to test drive what catches her eye and feels good in her hand - once she has her favorite fits picked she should test them in every caliber the pistols come in and pick the largest she can handle.
Revolvers are always the first thing recommended to us - ticks us off.
Most of us pick semis - even the women that have one revolver have multiple semis. 1911s are a favorite.
Please, please, please give her the cornered cat web site - she'll return to it many times as she moves through training and has questions or problems. Tell her she's been personnaly invited by a fellow gun toting mom to join the women's message board linked to cornered cat.