Hello! My name is Dr. Aida and I am glad to attend you on Healthcaremagic! Regarding your concern, you should know that diarrhea, which is not related to any infection, could be explained by autonomic nervous system dysfunction in diabetic persons. The chin numbness could be related to a pinched nerve, which is a common condition in diabetic persons too. So, there is no direct connection between the two conditions, but diabetes, may lead to this complex clinical situation. Anyway, I would first recommend performing a stool analysis to exclude any possible GI infection. It is also necessary to closely monitor her blood electrolytes to investigate for any electrolyte imbalance caused by diarrhea. A good hydration and a lot of electrolytes are necessary in her condition. Hope you will find this answer helpful! Best regards!