The 7mm-08 will be slightly more than a 243 in the same weight gun, it will have more a sharp "jolt" compared to more of a push that the 243 has. At least thats my take on the two cartridges. If she can handle a 30-06 the 7mm-08 will not be a problem.

Believe it or not, the gun I own that I least like punching paper with is my 25WSSM. Its a Browning A-Bolt Composite Stalker, and the stock is a lil too short for me, and that gun beats me more than my 7mm, or 270WSM.

What I'm getting at, if the gun doesn't fit you right, its going to be unpleasant shooting it.