Marine, do you have any friends or relatives close by who have some smaller caliber rifles THAT WILL FIT HER? If so, I suggest letting her fire a few different calibers, and see what she likes. Often for e beginning shooter, muzzle blast is more intimidating than recoil, so GET HER A GOOD PAIR OF EAR PROTECTORS before she shoots any gun! But yes, of course, start her off shooting a .22 rimfire, if she has not already done this.

The .270 indeed has less recoil than rifles using heavier bullets. But a .243/6mm Remington, .260 Remington, or a 7mm/'08 has even less. In additon, all except the 6mm Rem. will fit in a nice little gun like the Remington Model 7...... How much a person feels recoil often depends more on how the stock fits and stock shape than on cartridge. I've fired a couple of hot .30's (.300 Weatherby and .300 Rem. Ultra-mag) that did not feel bad at all due to their stock shape. There is also a line of what they're calling "managed recoil" ammo out now, which might be good to use while she's starting off.