Same here Joe. I had a strong hunch but since it was not a "scenario" we are working... I have tried to wait for you to post the test results before I posted. That would have given us more specific info to work with.
Since you are anxious for some help (rightly so since it’s a loved one), I will post anyway.
IMO, it sounds like typical type II diabetes giving her a hypoglycemic spell. The glucose tolerance test, fasting blood glucose and other lab tests can provide confirmation of that opinion.
Generally Type II diabetes is diagnosed based on lab work and signs/symptoms:
1. a fasting glucose level is above 126 milligrams per deciliter (mg/dl) on two occasions.
2. a random glucose level is above 200 milligrams per deciliter with the classic symptoms of increased thirst, urination, and fatigue.
3. a glucose level greater than 200, 2 hours after getting a standardized carbohydrate beverage (Glucose Tolerance Test).
I don't know how much you know about these type situations. So here is a very brief rundown of the two most likely events:
1-She could just be prone to hypoglycemia (low blood sugar levels) spells since beginning her weight loss and increased exercise regime. ( minor "other endocrine disorder")
2-she may have developed adult onset diabetes (type II is what it is called) from being slightly overweight as an adult. When you have diabetes, you usually get the classic symptoms of polyphagia (increased hunger), polyuria (lots of urinating), nocturia (pee at night), and polydipsia (lots of thirst). With this disorder, you are also prone to fluctuations in your blood sugar levels both high and low values. In classic type II, the insulin levels in your blood are usually either normal or actually even high b/c it is not a lack in production of Insulin (like in type I juvenile), but a lack of the effectiveness in the body of the insulin your body produces.
Good thing is if it is either of the above, a lot of times proper diet/exercise alone will control the disorder. Usually if that won't work, then a oral pill can be given to help control the blood sugar by increasing the effectiveness of the insulin you already produce. Shots of insulin are seldom needed for controlling type II diabetes so tell her not to worry about that. She is young . It shouldn't be a major problem for her. The main thing is early ID and prevention of complications that come about from not taking proper care of yourself if you have diabetes. Remember, this is only speculation. Until you get the lab work back, a definitive diagnosis can't really be made. Hope that helps.
Now, you listed lots of "thrust" in your post... that is something you should take up with her yourself without our help if that wasn't a typo for thirst! But that sounds like a GOOD symptom to have if it were my fiancée' LOL
BTW- Post more info when you get it if you want. Good luck Joe..