Cooking for Two

Get a subscription for her, called "Everyday Food."
Which is Martha Stewart's recipe magazine.
It is good.
It is simple and easy.
It is for a standard 4 serving size.

I have made a lot of things from this magazine.

I seem to remember that Taste of Home had come out with a cookbook for two but I'm not sure. You can probably google Taste of Home and check their website out.

Buy Rachael Ray's 30 minute meal cook books. Do they mind having leftovers? They wouldn't have to cook as much but still get healthy meals if they technically made a little more than what is necessary for just two people.

Taste of Home has something.

When we got married someone gave me a cook book called "Cooking For Two". It was great! I used it a lot and over the years still had favorites in it. Just doubled it sometimes after we had kids. It was 38 years ago. I bet theres something similar but more up to date on the store shelves now.

there's a book we love called 'cooking with 4 ingredients'. it's more for people just starting out but the recipes are simple and can give good ideas on how to put new spins on everyday things.

also i know you specified recipes for 2 people, but as a family of 3 (and 5 years ago, only 2) i can tell you in my experience, we just had to get used to eating leftovers :) maybe she can make good big meals and then freeze half for later?