I have deer hunted with the 7mm08, whic is a dead ringer to the 7X57. I think with a premium bullet at reasonable ranges it should be a encellent choice. You might take a look at some of new "managed recoil" ammunition on the market too. A shortened stock, fit to her dimensions with a good recoil pad should help too. I have a boyt safari vest with some shoulder padding and it helps tremendously. I bet "She-Safari" and some of the other retailers offer one for ladies.