I Am Visiting A Friend Who Has Been Diagnosed With

I am visiting a friend who has been diagnosed with a mild case of shingles. Rash has appeared only on a small area of her neck. She has taken 6 Valtrex over the past 48 hours and is experiencing waves of nausea, shaking, chills, some dizziness, middle back pain, and pain all the way around the area beneath her breasts. Should she discontinue taking the medication?