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Just sold one. They kick pretty good with buck and slugs. And the action should be slicked up to make them enjoyable shooters.
Do these kick much?
A nice recoil-eating semi with screw in chokes would be a good all around gun for your wife. Don't make price your first concern on a shotgun and find out you've pounded the heck out of her. Make felt recoil and heft of the gun the main concerns and you should end up with a wife that shoots with you.
If you want a auto-loader you could look at the Stoeger M3020, it's a 20GA. I have shot this model in a full length and it's worked fine for me. I shot the Benelli/Stoeger rep's (he is a friend) try guns at SST last month. http://www.stoegerindustries.com/m3020-shotgun
My wife is 5 feet/100lbs. bought her a Remington 870 youth model 20 gauge. 20 inch barrel screw in chokes, $325.00 used but like new. It will shoot 3 inch if you wanted.Carl