What about a handgun caliber in a handy lever action? .44 Mag, .357 Mag, .or .45 Colt. My mom is of a slight stature and she finds the .30-30 a bit much. I prefer the .32 Winchester Special or the .35 Remington, myself.
Here are some of the rifles Marlin offers in the 357, 44, or 45 Colt:
http://www.marlinfirearms.com/firearms/ ... 45colt.asp
Isn't hog hunting a short range prospect? If so, any of the above will be good inside 100 yards if you mixed the Marlin lever with some hot hunting loads from a place like Cor-Bon or Buffalo Bore.
If this isn't your cup of tea, I echo the recommendations for a rifle chambered in 7mm-08, .257 Roberts, .260 Remington, or 6.5x55mm SE. Unfortunately, sensible cartridges like these (7mm-08 exempted, of course) aren't all the rage so it's harder to find rifles in these calibers.
If feral hogs are anything like the ones we raised back home, they are tough creatures. You are going to need something that will punch through that tough hide and muscle.