I've decided to go to back to being a vegetarian: questions needing answers please!?

You gave her information and that's about all you can do. You could make her a vegetarian dish sometime or point out all of the things she eats that a vegetarian eats. Most people are surprised by what a vegetarian can eat. Imagine if you were vegan. Make your own food. You can make your own veggie burgers for a LOT cheaper than you buy them for. Batches can be frozen and heated. Whole foods is the way to go and only use processed meat replacement when necessary. There are many ways to get protein without using the fake meats. Tofu is less expensive in it's plain form than it is prepackaged. Get yourself a really good cookbook and you will find that it is far less expensive than most people think.