@ml williford, why build a magnum cartridge if recoil is an issue?
How far is she going to shoot at a game (i.e., deer at 500 yards)?
For the above example, a .260/AI or 6.5 CM is very pleasant to shoot.
I understand it is not for everybody, but a muzzle brake remains the most effective means to reduce recoil and muzzle rise. There are plenty of choices to choose from. Often the latter is not realized; spotting your target is priceless.
It adds weight, is pricey, and is a long wait, but suppressor is also gaining popularity.
My .264 WM was built to propel the heavies (i.e., Berger 156) but have the twist (1:7") to also the monos, i.e., 125 BD2 (G7 .302) and 135 BD2 (.358).
If you share the rifle specs, esp. the barrel twist, we might be able to guide you in your bullet choices better.
Just my 2-pence for you to ponder; good luck!