Your wife might benefit from the thread on eating what's in your pantry. It looks from your list like you're used to cooking from scratch and buying in bulk, and that means keeping the pantry stocked. But are you actually eating everything that's there in a systematic way designed to make the most of the money you've spent?
For instance, you've got a LOT of food on that list. We do a shop like that every 6 weeks or so. Then each week, we are at the grocery store only for the very few extra things we would need to flesh out the specific meals we're going to eat. In other words, now that you've stocked up, make a meal plan for the specific meals you're going to make out of those ingredients (and other things in your pantry and freezer). Don't fall into the trap of saying, ok, I've got quinoa and rice, but I feel like potatoes, so off I go to the grocery store, and while I'm there I'll just pick up...x,y,z. Look at the contents of your shelves, decide how you're going to use those ingredients, make a small list of other things you will need to complete those recipes, and then go and do one more shop this week for just those things on the list. Stay out of the grocery store the rest of the week! If you run out of something, substitute! Make it a challenge!
Lots of us fall into the trap of liking to have lots of food on hand, and then just deciding each day what we feel like eating. It's all yummy and healthy, so it's all good, right?! But it doesn't make efficient use of our money or of the food.
It can also be eye opening to think about the costs of the meals that you have in regular rotation. In our case, there was a big difference between the cost of eggs, potatoes, and veggies, or rice and beans and veggies, or chicken and quinoa and veggies. I realized that we could (as someone else here already said) eat variations of the cheaper ones more often and just that would make a difference to how much we spent. We did the same costing with snacks--those nuts were costing a fortune! We stopped eating them by the big handful, and I started making (way cheaper) muffins instead. More hard-boiled eggs, less bacon, etc. Looking around for the best price on frozen berries is one thing, but deciding to buy the cheapest organic frozen fruit, or just the cheapest local fruit (apples!) instead will make a difference too.