If you are looking for a 700 short action, Brownells in Montezuma, IA will be selling them shortly. I do not know if they will have left hand models. They have a website, so take a look.
The 260 would be my first choice for a girl's gun. Many of the guys here shoot them with excellent results. The rams sometimes fail to fall, but not often. Most shoot 140's for rams and 120's for the others.
I started with a 7x57 on a Mauser 98, then went to the .308, and have now settled on the 7mm08. All worked quite well. If Remington made a "medium" action, I would shoot the 7x57 as it has light recoil and ample power on the rams. It is very easy to load for. I have used a 98 in 7x57 for deer for many years and find it quite adequte.
Blamethewind