Before you all get too wound up in the idea of her carrying a P3AT- - - has she shot it yet? For that matter have _you_ shot it yet? How much of a shooter is your SO?
These little guns are great to carry but can be a bear to shoot. And they are _very_ vulnerable to limp wristing. They are not what I would call a beginners' weapon by any means. The trigger pull can be difficult to manage, getting the first round into the chamber can be difficult for someone who can't 'gorilla grip' the gun, the sights are rudimentary at best, there is no slide lock... I hope you get my drift.
Some KelTecs suffer from a variety of 'issues' and need attention to get them to run right. They are tiny in size, light in weight but chambered for a relatively large round for such a small gun. It is my opinion they are running at the edge of the envelope and it doesn't take a lot going wrong to make them choke. They need to be clean and properly lubricated and can sometimes require ammo the individual gun likes to be dependable.
That said, my wife and I both frequently carry 1st generation hardchromed P3ATs. We have not had any problems with them at all, we think they are great little pistols- but neither of us would recommend them for beginners. Both of us are in our fifties, both of us have been shooting and carrying for decades. And neither of us finds a P3AT a pleasure to shoot, unlike practically everything else we practice with.
I don't want to sound overwhelmingly negative, but I don't know your situation or hers and i would hate to see her have an unpleasant experience with any firearm and especially one I like so much and have recommended to others. That recommendation always comes with a warning about this particular gun's difficulties though. If she is a shooter she can do quite well with the P3AT- my wife loves hers, it's in her hip pocket in the factory zipper case right now. That's how she prefers to carry it and she practices drawing, clearing the case and firing. I prefer a pocket holster myself. But if the gun is carried with a round chambered, it should be in some sort of dedicated container that encloses the trigger guard completely. It's the only way to carry it safely IMO.
Hope you both like it A LOT,
lpl/nc