Lymph node TB. Lymph node since 1 year!

My mother is suffering from lymph node on right sight below throat the node is very small Before 1 year she done ultrasound that shows 2 small lymph nodes. After that we done mantox test results 8mm and blood test some lymphocytes increases On this basis a doctor told this is TB. But I visited in civil hospital tb section they done fnac a needle insert in small tumour but lymph node is very small so does not find anything on their basis their conclusion is no TB bcoz they said 8 mm mantox is not proove and lymphocytes increase is not perfect coz for tb and node is very small some time it doesn't seen. Please suggest my mother is diabetic patient since 1.5 years but it is normal having tablets tendia m. Please suggest how many chances of TB. No increase size of lymph node since 1 year