I'm going to go another route here and suggest that you get something a little bigger. If you don't already own a .38 or a .357 revolver, then there is a hole in your collection that needs to be filled anyway. If she is small statured, then this might not be best, but there are so many aftermarket grips available that she'll find one that both of you will like.
My reasonong is that most new shooters aren't too happy making tiny holes in the target when they start out. If you bring her to shoot, I'm pretty sure that you're going to have the target close so that she can consistantly hit it. At least that is what you should be doing. A revolver has a much simpler action than an autoloader, and the learning curve is much faster using a revolver because of it. People are less intimidated by it. Let her shoot light target loads, preferably wadcutters, since they punch such nice round holes in the paper. That gives her immediate feedback when she's shooting, since she can see where each shot went on the target. There is only a tiny bit more recoil than a .22, and she'll take it a lot more seriously. Stress safety, and if you have a pair of those electronic ear-muffs, let her wear them so she can hear you talking to her. Remember eye protection, and in no time at all she'll be loading, shooting, and unloading a revolver on her own. Having confidence in your ability is what leads to further interest, and in no time you'll be shooting together regularly. The trick is to make it fun, and for her to have some success right away.
The .22 is a fantastic cartridge to refine your ability, and probably one of the most inherently accurate in most handguns, but most new shooters feel like it's riding with training wheels. It's when a shooter wants to really improve their abilities that the .22 comes into it's own. Right now you have someone that wants to see what it's all about. A quality 6" barreled revolver with large adjustable sights in either .38 special or .357 magnum will be able to fire wadcutter loads into tighter groups than just about any centerfire autoloader anyway, so it's something you'll want to own even if she decide shooting isn't for her. I don't know if that will be the case with the Walther.
To kind of qualify this, I am primarily a target shooter, and and I'm thinking that you're doing something similar. If you usually shoot out in a sand pit someplace, or just plink at cans and stuff for fun, then maybe some of this does not apply.
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