I already posted the buckmark ($219 at Academy) and saw that the S&W 22A is $198. If she is anything like my wife where she will occasionally join you at the range, doesn't like but doesn't dislike shooting and really could go either way I don't think just buying one of these plinkers is a problem at all.
Now I have only with my wife for the last 8 years and have found that she doesn't really care about shooting but likes to go if it is a nice day. She would rather shoot at 7 yards than 25, and if possible would rather kill some cans instead of paper. Her hands are roughly the overall same length as mine (I have square hands with short fingers and she has small/narrow hands with longer fingers) so any gun that fits me fits her reasonably well.
I was looking for a new centerfire gun. Both of us have shot a Glock 23 and shot it well but didn't care for the recoil. I wanted to get a gun she wouldn't mind so decided to get a Glock 17. It is my gun, but she doesn't mind shooting it. My Ruger Blackhawk OTOH is too heavy and she doesn't like the way it rolls in her hand.
Back to my point...she is as much a shooter as most people. If it is a nice day she'll come out, if not she doesn't. She wants to have fun, and doesn't want to punish herself shooting a bunch of heavy .45 Colts or .40 S&W or 10mm or any of that. She likes to shoot a .22 and doesn't mind a 9mm. So guess what the next gun I buy is going to be...a .22 semi auto. Why? Because I don't have one and everyone loves to shoot them, my wife included.
Just don't buy a gun for your wife that you wouldn't buy for yourself. I have not used a Buckmark, but it looks to be a quality gun. When I buy a .22LR I am going to use it a lot, probably 10:1 ratio between me and my wife for usage. So I am not going to buy one that I wouldn't want myself since I am going to use it often as well.
Now, if she does take to shooting all of her next purchases will be up to her. But in the case of my wife, I know that she really doesn't care (she has told me on numerous occasions). All she wants is something in .22LR that is reasonably accurate (tear out the center of a target at 7 yards - so a 2" group at 7 yards, which I think is quite reasonable for any decent firearm) and is reliable (doesn't want to be clearing jams, dealing with light strikes, etc. etc.).
Best of luck! Let us know what you get! Hope I made sense, it is getting late (for me) and I am getting stir crazy being stuck in the house from the ice storm.