My first thought as a nurse is that your wife needs to have a thorough check-up of her health status. Diabetes is when the sugars are too high, so if she is taking oral antidiabetics or insulin to control her sugars, one of the side effects is that it can pull it down even lower. Some other medications, such as blood pressure, also have side effects that cause hypoglycemia, as does alcohol.

The main goal for managing diabetes is to re-establish a balance, between diet and exercise plus or minus medications.

Given her bouts of sinking low are often, something needs to be adjusted.