Women suck at handling recoil and the higher calibers scare them, every women I have met who was taught to shoot by a man always ends complaining as to why she can't just use a .22. Even .32 ACP requires multiple arguments.
And that's assuming you can even get her to carry it instead of just leaving it at home and forgetting where it it.
The simply fact of the matter is that women can not be trusted to defend themselves, that's a mans job.