Ok then a rigid stock , some weather resistance and a removable bi--pod is on the cards . I would go for something with a standard shape laminated stock and stainless .
Either a Tikka T3 Laminated stainless or a Howa laminated stainless as the stock shape is also ok for spotlighting and stalking . The x -bolt's varmint laminated stock is too radical and will restrict uses dramatically but the Eclipse Varmint looks good except don't bang the thumbhole stock around as they do tend to crack at the top . Don't sacrifice a rigid laminated stock for a heavy barrel . A heavy barrel in a weak plastic stock is little advantage .
Salo 85 laminated stainless would be good also. Go heavy barrel if she likes it as long as it comes with a standard laminated stock shape , stainless and 204R chambering off course . Don't let her worry about one being a tad heavier than the other , off the bi-pod and out the window it will not feel much different but extra weight on the bi-pod helps accuracy . I don't see a pressing need to go heavy barrel in a 204R really .
Bi-pod should be an Atlas with a Quick Detachable 1913 Picatinny rail mount . Just buy a short section of Picatinny rail from ebay ( also called a 1913 rail ) and screw it under the forend well forward so it don't get in the way resting the forend on a sand bag , BR rest or window rest but it must be nice and straight inline with the barrel . http://www.ebay.com.au/itm/Atlas-Bipod- ... 20f28ec9f2
If an atlas is too expensive then go a Harris BRMS with pod lock and buy an American defence adapter for the 1913 rail or just connect it to the sling stud .
It is still removable but not as rigid .