Hi,
Sugar spikes are not only related to sugar, but mostly to carbs. Even if she doesn't eat candies, cakes, etc, she will still have spikes with foods loaded in carbs like white breads, white pasta, some fruits that are naturally loaded in sugar like grapes, for example. Her family should watch for her diet and include whole grains instead of white flour, fruits that are low in natural sugar, check her blood sugar often and the most important thing: have a talk to a diabetes educator.