Shotgun fit is critical- you're wise to try and get a proper fit for her.
It's hard to shorten up a Mossberg 930 much, because the bolt return tube comes back almost to the recoil pad in the stock. A good gas operated semiauto is your best bet. A good used Remington 1100 should do OK, she should be able to get the job done with 2 3/4" loads but there are some 3" 1100s out there if you're willing to look for one. And a wood-stocked 1100 is little problem to get shortened enough to fit most anyone- the design still has a bolt return tube in the stock, but it doesn't go nearly as far back as the Mossberg 930.
For a short while Remington made a less expensive version of the 1100 called the Sportsman 12 Auto. Those turn up from time to time, and are usually good deals- worth looking for anyway.
Spring for a premium recoil pad too, it'll really help. Tell whoever is grinding the pad to fit that it's for your wife.
Mindset - Skillset - Toolset. In that order!
Attitude and skill will get you through times of no gear, better than gear will get you through times of no attitude and no skill.
Last edited by Lee Lapin; October 6, 2009 at 08:51 PM.