For a cold and runny nose, she should choose sugar-free medications. To treat a runny nose safely, antihistamines like loratadine or cetirizine are excellent choices as they do not affect blood sugar. If she has body aches, acetaminophen is generally safe. She should avoid oral decongestants like pseudoephedrine or phenylephrine, as they can raise both blood pressure and blood glucose levels. It is best to choose tablets instead of liquid syrups, which often contain hidden sugars. Please encourage her to rest, stay hydrated, and monitor her blood sugar more closely while sick. Consult her doctor if symptoms persist.