At 1100, it's unlikely that she would be unable to stand, walk or keep any food or liquid down due to "Diabetic Ketoacidosis" which can be fatal. That condition occurs at 600 or higher. If 1100 is her blood sugar level, her doctor (more likely an ER doctor) would be looking for a serious infection somewhere, which can cause blood sugar to spike. 3 years ago, I was hospitalized for 8 days - 3 days in intensive care for Ketoacidosis and Sepsis due to a dental infection & a botched root canal that spiked my blood sugar to 705.
Does she use insulin? If her levels are that high, she would need insulin to survive - especially if she lacks self discipline with sweets. When her blood sugar is high, she would need a fast-acting insulin (Humulin, Humalog, Novolin) to bring it down in 2 hours or so.
20 gms of sugar is not a large amount. A large apple or orange has 20 gms of sugar. Most bread has 22 gms/slice. A slice of cake or pie can have 60-80 gms sugar. A 12-oz can of soft drink has 40 gms sugar, which is 10 teaspoons (10 of those restaurant packets on tables).
BTW, A1c is not a measure of current blood sugar. It is a measure of average blood sugar over the past 3 months. It measures the percentage of red blood cells that are coated with sugar. They are replaced every 3-4 months; that's why diabetics can determine their average blood sugar over the past 3 months. Non diabetics' A1c is around 5% - 6%.