Some guns (for instance the Beretta 687) have noticeable cast-off which would be a "fit" problem for a left handed shooter. If the gun in question doesn't have stock fit issues then I don't see a big problem. Of course the top lever would operate backwards for her but I s'pect most lefties are accustomed to operating things backwards?
Only 2 problems I see with that! First is that most women need a shorter stock than a man the same size. Second most women also need a adjustable recoil pad that allows them to not only lower the pad to bring the gun up, but more importantly they need it to twist even more. They are just built differently then men. But no reason she just can't go out and shoot a few with your gun until she wants one of her own. Have Fun and Break-em all. Jeff
The answer to your question is you are wrong. There are left hand guns and there are right hand guns. Getting her started with a man sized, 12 guage, O/U is not the way to go. Maybe one of your friends has a gun with an adjustable stock that you can borrow. Also low recoil shells will help. HMB
Very few Euopean guns have dead straight stocks, most have some cast at the comb but some have none. Almost all have cast in the toe. The best way to check for this is rest the stock your toe and sight down the bottom of the barrel looking at the underside end of the stock, if the toe points right, it won't work for a left hander, it will make the gun dig into the shoulder. You can correct this with adjustable pad hardware. With all that said unless you want your wife to shoot just once and never again just hand her an ill fitting gun and three dram shells and her shooting career with be over, trust me on this....... Put her on a right sized gun and (super lite shells)and you might have shooting partner for life.