Hello, when diabetic patients feel exhausted, hyper or hypo glycemia should be ruled out. A self-measurement should suffice. If it s too low then immediately replenishing the missing glucose is essential. Do not try to give anything by mouth if she s not alert or the food/drink may end up in her lungs. Call for help in that case, because she should be transported to the hospital. If the blood sugar is too high and this has been going on for many days then she s probably dehydrated and needs further investigation and fluid replenishment. Of course there are possible causes of exhaustion, including fever, electrolyte imbalance etc I couldn t give a more specific answer with the provided information. If you need further guidance, then please provide the details (did she have any symptoms the last few days? fever? what drugs does she take? etc). I ll be glad to help. Kind Regards!