If you're not in a hurry (you probably are if it's for your wife..
) I would keep my eyes open for a used beretta or browning. I picked up a mint used 686 20g several years ago for $1500. Pretty close to what I paid for my CZ SXS Ringneck ($1000) in 20g as well. Never had any problems with either gun, but I've only used the CZ for grouse hunting, whereas I've used the beretta for hunting and sporting clays and has had many, many more rounds through it.
And as others have stated regarding recoil (if that's a consideration for her)...that beretta in 20g is a lightweight grouse gun with 26" barrels and the recoil is about the same as my browning cynergy 12g waterfowl gun when shooting sporting clays.