NEF handi-rifles come to mind (if things go wrong you can buy another barrel in a caliber that YOU want

)
And the .243 comes to mind in cartridges. I've shot my friends, and it had more *noticeable recoil than my 22-250...but not much, not much at all. Both are guns are/were big-scoped 700s so they had at least a pound or two over the handi-rifles.
http://www.chuckhawks.com/recoil_table.htm make sure to notice the differences in gun weights. (don't you wish the 6.5swede was more popular....I sure do)
I don't know what kind of recoil pads the handi-rifles come with but I would put a good pad on before she takes your first shot. The new remington pads (R3, i think) or awefully soft.
Didn't read you first post that well, if their youth models are going around 8 pounds there won't be much difference with the 700s aside from scopes.