I would have to say a Rem Model 7 as well but slightly different than above.. I would put a McMillan Sporter weight stock (Light Fill) 24" Fluted, Sporter weight Mike Rock, Hart, really any high quality Stainless Barrel. will do but Mike Rock would be my first choice
I peice base with Aluminum Rings
Badger makes them ...slight overkill but really nice and sturdy! as for Chabering ..not sure what she is shooting now that plays a huge roll but 7mm-08 would be a good one or a 260 all depends on how she handles recoil,,,everybody is talking about making this rifle as light as possible and even some of the light Carts mentioned may pop a bit for a small lady. just something to consider when going light...I would say for this application a muzzle break would (not) be a good choice just because they are LOUD! and the muzzle blast may affect her shooting ..it is quit a distraction if your not used to one. IMHO Good luck ..I'm actually tossing this idea around myself for my daughter she is only 7 now but hey you can never get them started to young.