Low-fat salad dressings are often higher in carbs and sugar. There's nothing wrong with fried (unbreaded) foods, cheese (not cheese sauce) or butter if she's looking to cut sugar. Like an above poster, I do Keto, which is high fat, moderate protein, very low carb, and can find appropriate menu choices at pretty much any restaurant (except some italian restos, which tend to be pasta/starch heavy). Usually at a resto I will opt for steak, grilled unbreaded chicken, or unbreaded fish and pick low-carb veggies for a side, or a salad and then go with oil/vinegar, salsa, guac, or a full-fat dressing in moderation. If you're craving something other than water, skip diet soda and get unsweetened iced tea.
Good luck! Dieting is very hard, but you can do it!
