Ok doc, lol
Well, I'm serious.
20-50 grams of carbs per day puts most people into ketosis.
3/4 cup of oatmeal is only 35 grams carbs. The veggies probably had little to zero carbs.
Such a low carb diet would level her blood sugar and require hardly any insulin for regulation.
Where they made an error was restricting the fat in her diet. She must have been miserable.