Realistically, it will depend on what part of Texas she is in. The larger cities have more stores and thus competition. I would say $35 to $45 for the types of food you are listing. It is often more expensive to cook for one since food isn't prepped that way, or if it is, it is more expensive. You face the dilemma of buying too much and having it spoil to save some money. This sounds counter-intuitive for one, but cost-wise, it is often better to get some fruit items at places like Costco or Sams, knowing they can't eat it all, but it is still cheaper than a regular grocery store. You can get about 10-12 bananas for $1.49 at Costco. Even if you only manage to eat 8, it is often less expensive than regular stores.
dang-you could make a good living exporting those Costco bananas our way! one of the local stores was selling bananas (ON SALE) for 75 cents EACH, and the college kids were grabbing them up b/c they go for over 1.50 on campus. a small (pathetically small-maybe 2 servings) cantaloupe is on sale this week for $2.50, microscopic 'mini seedless' watermelons are on sale for $3.99 each, and strawberries are a STEAL at $4.00 per pound. none of these prices are for the organic options which go for a much higher price (and sadly go bad if not consumed w/in about 48-72 hours so there's allot of waste unless the kids who buy them go to the store every couple of days).