Metastic Squamous Neck Carcinoma

My mom (71 years old) has recently been diagnosed with Metastic Squamous Neck Cancer - Stage 3.  It has metastasized to her lymph node on the right side of her neck (large and visible), and the diagnostic CAT Scan and Ultrasound detect a small tumor in the lymph node on the left side of her neck.  The tumor seems to have originated from a cancerous tonsil.  Her team of doctors recommends a very "aggressive" treatment... i.e., Chemo once a week for 6 weeks, and radiation 5 times a week for 8 weeks.  Because it has spread to her lymph nodes already, and was categorized as Stage 3, I was wondering if this treatment is aggressive enough to reduce/eliminate her tumors?