Several members of my family have hypoglycemia, including me. We’ve always kept it under control by making sure we had access to sugar at the appropriate time, not by keeping from it altogether. Oatmeal is a high carb food, therefore holding back on the sugar still left her with a lot of carbohydrates. Atkin’s allows "Old Fashioned" oats since there is more fiber in it, but most people get either quick oats or instant oats which has most of the fiber removed. It’s not just the sucrose that needs to be watched, it’s all the carbs, as well as when they are eaten.

Loading down on carbs in the morning sets up an insulin response for the rest of the day, which hypoglycemics will respond to with a variety of symptoms from uncontrollable appetite to irritability to light headedness, etc. I either skip breakfast or have eggs and sausage/ham/bacon. (in spite of what the hype has been, the white of the egg has more than enough lecithin to handle the cholesterol in the yolk. Tests have shown that eating eggs lowers your cholesterol since the excess lecithin allows your body to handle even more than what you get in the yolk)

Sweets later in the afternoon and evening (early enough to avoid the sugar rush coinciding with bed time) have never really bothered me or others in my family with hypoglycemia. The night fast seems to reset the insulin response.