Thanks again everyone for the responses. To clarify, she has food stamps in addition to her disability check, which is $900 a month. So there is other money to use for food, however her bills chew up the majority of her check so she pretty much eats off of the $150 in food stamps. Also, I can pitch in some money to help as well, so I don't want to get too hung up on the budget, but the goal is to be around $150 per month.
I see a common thread here on farmers markets. It's something that I "know of" at best, but haven't been to a farmer's market recently nor do I know where they are located. I'm assuming I can just google it up and go from there. However when we're talking about cost savings, how much of a savings can one expect to have? I always thought the farmer's market was more expensive not cheaper, because the quality is better. To maximize the savings, do I need to buy in bulk? If so, I imagine as Eamon was pointing out, I can look into fermenting or other means of preservation.
In addition to budget, cost, and purchasing food, what is the best way to prepare all of this? I've never had to cook so much food at once; is there a method to the madness I should follow? Should I do things like par-boil veggies or protein so when I go to saute them they cook faster? Do I prep/breakdown the veggie first and later proteins? Should I shoot for weekly shopping trips and food prep or would I be better off doing 2 weeks or more at a time?
Again, I cannot thank you all enough for the responses, PMs, and E-mails to help me with this task.