I'll have to agree with the last few posts, a Remington 1100's the way to go, maybe even a 12 gauge with, very easy to buy off the shelf, light loads such as Winchester AA Xtralites (though a 20 would be less intimidating). There's always old stocks lying around, or for sale on eBay, so it won't be hard to get a new stock as she outgrows the old one.
Steve

Approach life like you do a yellow light - RUN IT! (Gail T.)