I went to the CrimsonTrace.com website first to get an idea what's on the market. I'm not a laser-user and didn't know.
Two guns caught my attention which the CrimsonTrace for which indicated it had products. I've not handled these two to much extent but recognize them as quality with good support & following:
-HK45C (.45ACP)
-S&W Shield (9mm or .40)
I don't know what/if there are shoulder holsters readily available when configured with a laser.
For a 1911, I'll seldom recommend a 1911 to anyone, even though that's what I'm usually carrying if not a Glock, along with a S&W J-frame for a backup gun. If someone insists, then by all means go with a 1911. Just choose one which has the highest chance of reliability as it's no fun shipping a gun back for any kind of work. You said she's already having problems with the slide release of your 1911, although this could be a training issue. My smaller 1911 is a Colt Commander #O4691. There are some nice, lighter models available than what I have, too.
I don't recommend the S&W J-frame, alone, due to its low round count and strong recoil in a .357Mag caliber. Again, if one insists, I'd then recommend the 640Pro, which I also carry.