In Texas, you have to qualify with either a semi auto or revolver (.32 & up). Qualifing with a semi auto allows you to carry anything you want (SA Stamp). The NSA stamp (Non Semi Auto) pretty much restricts you to revolvers. So here, to get the CHL, I'd say get qualified with the semi auto. Qualify with a rented Glock or S&W Sigma (both 9mm) if she really doesn't know much about how handguns work.
Now as to what to actually carry - if she doesn't have a particular preference for anything - I'd recommend a S&W M-36 .38Spl (or something similar). Adequate power, easy to operate, small & concealable, recoil adjustible from mild to heavy, reliable, accurate, etc. Such a revolver is just about perfect for someone who isn't particularly "into" handguns - but desires a reasonable level of personal protection.
Actually such a revolver is what I carry most of the time. Primarily for convenienance sake - and I really don't care to screw around with something that requires a lot of practice and constant maintenance to be assured it will "work every time".