A.M.
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?