Gene,
If she feels positive about a .22, then I'd "declare victory" and get her one with all the ammo she could shoot!
If it's not too late to track down an S&W in .22Mag, I'd really go with that if she's for it. I think Bill Jordan was pretty impressed with that caliber, and that's a pretty good recommendation! If it's .22LR, take heart--I think few BGs want to suck up a half-dozen slugs of any flavor!
I used to be a hollow-point-at-all-cost guy, but in recent years I've changed. Best I can tell, expansion will increase likelihood of cutting thu something important as far as the bullet penetrates. . .but that same expansion may stop the bullet so soon that penetration essentially fails.
I've never compared the calibers side-by-side, but I suspect a factory-loaded .32 S&W Long is probably no louder than a hi-vel or hyper-vel .22LR. Loaded with a wadcutter, that .32 is a better proposition on the whole (except for ammo expense vs. .22). Plenty of fine .32s available at on-line auctions. If she's not comfortable with it, though, it ain't happening!