Well, for your (girlfriend's) use, I'd say a bit snappier than you're looking for. The Shield shoots softer. The LC9S Pro is quite a bit lighter, and it's got a slightly higher bore axis than the Shield. It fits my small fingered hand better than a Shield, however, with greater purchase.
For a small, (fairly) light-weight, and shootable 9mm, we've had good experiences with the Beretta Nano. The little thing is built like a tank, and is a 6+1 or 8+1 gun. Some folks are thrown off by the lack of an external slide stop. Just takes a little change to your manual of arms to handle any stoppages. The only thing that ever hung up any of the ones (3 or 4? I lose count. I'm terrible about changing things up and going back to the same guns) I've had was the very first one hung up on WWB (go figure!) once or twice in the first 100 rounds, then never gave another problem. Every other one ran like a top. Run good ammo through them and they run great. Something about the trigger and weight distribution seem to contribute to a soft shooter. My theory on DAO triggers is that if they've got resistance throughout the trigger stroke they seem to help contribute to your grip as you squeeze through, stabilizing things. The Nano has such a trigger - not quite like a DAO revolver or Sig, say, but it doesn't feel like it stacks at the end of travel like a Glock.
You might see if you and she can put some rounds through one. It's not going to recoil like a 42 (when it runs!), but subjectively I'd say it's softer than a Shield, and QUITE a bit smaller to carry around than most other 9mm's... For that matter, the Sig P290RS can be had in 9mm and now 380, and that's a nice little DAO runner...
Missed this post somehow. A buddy of mine has a Nano, I'll have to meet him at his range sometime and try it out, thanks.