What a fabulous garden she has. Her system actually seems pretty similar to what I'd like to do when I have a real house with more than just a tiny kitchen. I bought a ham for .59/pound in December and all I could think was how much I could save if I had the space to buy three instead of one. I'd also love to can and, as she does, make things like steak sauce, etc. that people typically buy from scratch. I can get past the religious thing and admire her amazing frugality and also POSITIVITY!! She's not complaining, on the contrary she seems extremely content to make do and still enjoy her life.
My mom probably spends closer to $200 or $300/month on groceries because she buys more junk food & doesn't can, but my mom does the same thing w/setting absolute prices she'll pay for things. Her goal, last I knew, was to make each meal for less than $2 and it's usually enough for 3 or 4 meals between her and my dad. Once I have a little more space to keep things on hand, I'd like to do the same thing more rigidly.