Enlarged Cervical Lymph Nodes. Or not!

My mother aged 58 years discovered a lump below her left jaw about a month ago. We visited a ENT surgeon  who ordered FNAC  lump & USG NECK. The reports statements are : USG report states multiple enlarged lymph nodes in the left submandibular region and anterior cervical chain. Some are matted. A submandibular lymph node (25×11 mm) is diffusely hypoechoic with evidence of necrosis and shows increased colour flow. Also it also states nodular thyroid disease with multiple ( approx 4) hypoechoic nodules of approx 5-7 cm in size are seen in both the lobes. No evidence of calcification or any cystic lesion seen. While the FNAC  reads smear studied under giemsa staining shows adequate material with moderate cellularity composed of amaal/large lymphoid cells admixed with plasma cells and degenerated epithelial cells in a haemorrhagic background. Bacterial colony seen. Cytological features suggestive of chronic lymphadenitis. Should we go for Excisional biopsy as advised by ENT surgeon or not