My GF only really plays Candy Crush every day, but other than that she doesn't game at all, and she's been loving SnipperClips.
This is a game that's pretty quick to grasp and the controls are pretty easy. There aren't really any time limits and you can attempt things as many times as you want. No deaths or game overs.
Just remember to communicate when you're playing together. And try not to blurt out a solution if you know it instantly -- it's more fun to work things out with people who aren't well-versed in physics-based puzzle games. (My GF gets frustrated with me if/when I do this, so I've learned to slow down and let her simmer in her thought process a bit even if it's immediately apparent to me what we need to do. She's come up with great solutions of her own this way!)
