Thank you so much for your suggestions. I will ask her doctor for the sugar level test. You are right, it looks a lot like hypoglycemia. I truly appreciate your help.
Another possibility is that she is dealing with hypoglycemia. Low blood sugar can cause bad headaches. Some people over-react to carbs that they eat by producing too much insulin, which causes blood sugar levels to drop after eating and sometimes also to drop if a long period of time has expired between meals. So headaches either before a meal or after a meal could be a symptom of blood sugar lows. You may want to ask her doctor to test her glucose tolerance.
Sounds like she may be having migraine headaches. Many people with migraines notice triggers that can start them off. Maybe hunger is one of hers; stress could be another. There are variety of medications available for children with migraines. The specialist to work with in this area would be a pediatric neurologist with an interest in headache. Good luck.
Asmik,
We are volunteers and not medical professionals. You've taken the right step by keeping careful records of how she feels and what she's eating.
Common symptoms for Type 1 diabetes include frequent urination, insatiable thirst &/or hunger, unexplained weight loss, sometimes lethargy and vision changes. Depending on your daughter's age and general activity levels, the doctor might well evaluate stress (stress can be around food/eating).
Good luck with the evaluation and I hope you'll quickly find out what's going on so you can fully support your daughter in her pursuit of good health.