Well it would be really bulky I think in the bra holster... She doesn't have HUGE boobs like the girls on the videos... She could conceal a J Frame or a LCP well... Hmmmmmm.... Maybe she could hide a CM9????
I think we should have some pictures to verify she couldn't carry a .44 mag in there.
In all honesty, carrying anything is better than carrying nothing. For those that say it will just turn a carjacker into a killer, let her shoot him in the face and see if the .22 doesn't sting enough for her to get away. A .22 can and will kick a lot of things, sometimes it just takes a couple of shots. If she is comfortable, "let" her carry what she wants.