Couple of recipe suggestions for you to try to tempt her that don't take so long that it doesn't matter if they're rejected (in my house the whole family goes for them with relish):
Potato with jewels. Boil then mash potato with some butter and milk. Meanwhile, cook some frozen mixed veg and poach fish in milk - salmon is good because of the colour, or you could use yellow smoked haddock for the same reason. Once cooked, flake the fish into bite-sized pieces and drain the frozen mixed veg. Stir fish and veg into mash, spoon into oven-proof dish and keep in fridge until you need it (up to 24 hours). When wanted, bake for about 15 minutes in hot oven. If you leave out the veg (cook fresh and stir in before baking), the non-veg fishy mash freezes well - defrost in fridge overnight.
Potatoes with hats on. Bake a potato, slice in half, scoop the cooked flesh out of the skin into a bowl. Put the skins on a baking sheet in a hot oven for about 10 minutes to crisp up (salt them first if you wish); meanwhile mush up the flesh with some mayonnaise and grated cheese. Serve potato in two heaps (man, woman) on the plate with the skins placed like hats; make features and "hair" with peas and carrots.
You could also try a risotto. The basic recipe on the back of the Gallo pack is pretty routine. No reason to leave out the wine since the alcohol burns off (and you can enjoy a glass whilst stirring!) I usually add frozen peas after about 10 minutes and cooked chopped ham from the deli at the end of cooking. It's also good with smoked haddock.
Have you tried getting her involved with the cooking? That worked a treat with my toddler.
Well, you can but try! Good luck.