As everyone says:
VX2 3-9x40 or a used VX3 3.5-10
Of what you're thinking, only the Leupolds have the combination of body tube length and eye relief that will let you mount the scope comfortably for her (aaaaaal the way back, and aaaaaal the way down... You'll likely even need extension bases!)
And they're great scopes, perfect warranty, and they hold their value.
Length of pull should be chosen by breadth of shoulder. It's about how close or far you can are to the rear bridge for optics, so unless you got her a short LOP rifle, this will be critical!
Warne extension bases for a Remington 700, vortex viper or egw aluminum rings (egw is better, get them at Hirsch Precision) The viper rings are a good idea executed terribly, so you'll need to break a ton of sharp edges with sandpaper. Alternatively, cheapo weaver rings are actually really good, but they scratch the crap out of your scope, and are a pain to set the scope in level.
Leupold reversible front extension bases and rings might work too.
I've scoped a lot of vanguards and such. PM me. I might actually have a ton of the stuff I mentioned above lying around.