Greetings! I don't think I have to tell you that your life is at risk with her and if you were a woman I would be telling you to get out quick. Of course everyone makes their own choices and health care choices in life and is responsible for their own healthcare. Her life is at risk from a disease.
A diet change might be in order to help keep blood sugar levels stable. Sometimes sweets or juices are indulged by some people with disastrous results. It has been said that some foods with fats and starches are released more slowly. Good amounts of things with fruits, grains, nuts vegetables may help the pancreas with the needed enzymes and minerals to regulate sugar properly. Food should be chewed very slowly because the brain regulates how much insulin is put out partly based on what is in the mouth and time is a factor in how long it is in the mouth.
A professional nutritionist could be seen. It seems to me that nowdays snacking is recommended to keep blood sugar stable but to me at least this ruins a stomach because it requires constant digestion and the stomach has no time to rest and wears out causing subsequent stomach pain and more problems with digesting food.
Snacking may causes a person to gain weight with of course resultant health problems connected to it. On the other hand if no snacking is done and the sugar is not watched and it goes to far brain damage can happen.
The sugar should be watched after meals to see what is happening to it. It is said that even a very small amount of peanut butter under the tongue can help a hypoglycemic episode. A sandwich half for a snack or crackers are said to be better than cake or ice cream if a snack must be chosen. The sweet sugars or juices enter the body and cause a sharp upward leap in sugar followed by a sharper downturn in sugar and it makes it go lower than before.
A deaf person with a low sugar may have a voice change as sugar lowers because they cannot hear the change in the voice. A hearing person who is alert may hear the change in time to help the deaf person with it. Irritation with low sugar is common especially the lower the sugar gets and there may also be sweating, the eyes may glaze over a bit and confusion may be present or irritated expression as a sign. A symptom might be a headache or feeling jittery.
I would study the disease and learn as much as possible about the body and its workings. Peace, sjb