As it sits I'm liking the 7mm08 and 6.5 Swede the best.
I'd go 7mm-08, then:
1. Seems around here factory 7mm-08 ammo is more available than 6.5Swede.
2. Being a short action, your wife might find the 7mm-08 easier to cycle.
3. More rifle options available in 7mm-08.
4. Being based on the .308, a 7mm-08 can be re-barreled to any .308-derived cartridge if you or your wife eventually want something else, but otherwise love the rife.