I looked at the USA menu and there are only a handful of healthy options (the salads, and possibly custom egg only dishes via the all day breakfast menu and talking to the line cook)
https://www.mcdonalds.com/us/en-us/full-menu.html and that's without the salad dressing, were this the only diet available it lacks any substantial quantity of fruit, dark green veggies, fatty fish, whole grains/nuts off the top of my head that are usually recommended as items in a healthy balanced diet, the salads are also mainly iceberg lettuce which is not that great nutritionally. Also, not sure what would fit into her choices as diabetic.
Chicken Nuggets, Egg White Delight, Grilled Snack Wrap, Sausage Burrito, Egg McMuffin, Sausage McMuffin (w egg too), Fruit and Maple Oatmeal, Fruit n Yogurt Parfait, Strawberry Banana Smoothie, Mango Pineapple Smoothie, Gogurt, Fruit slices, Artisan Grilled Chicken Sandwich, Grilled Chicken BLT Sandwich, Southwest Grilled Chicken Salad, Bacon Ranch Grilled Chicken Salad, regular hamburger, coffee. We can leave Filet-O-Fish and Fries in the more debatable categories but the fish and potatoes themselves are nutritious.
It's also as much portion size and controlling intake of fries and soda as it is about the food items themselves. Adding a large coke to any meal is probably worse than the food itself. 80g of sugar with no nutrition or fiber.
I'll give you that its a low source of nuts and unbreaded fish. But if we are talking about working at McDonalds and not having meal prep time, that could be supplemented by bags of almonds, pistachios, peanuts, cashews, sunflower seeds, pumpkin seeds, and cans of tuna, salmon, and sardines at home.
That leaves dark veggies. Their bacon ranch salad says its "romaine, baby spinach, baby kale, red leaf lettuce, ribbon-cut carrots and grape tomatoes." Youd probably want to supplement some cooked greens at home.
Being able to buy the above food at 50% off would, imho, be a great foundation to a healthy diet, if you can control portion and avoid temptation.
