Hi, I had gone through your question and understand your concerns. You should be worried but not too much. She has enlarged lymph node due her viral infection, pharyngotracheitis or bronhitis. You may easily get her back to normal range. I see similar cases amongst young people who visit my clinic. In the first meeting, I advise my patients to go 1. Anti Inflamed therapy-Calpol according to age during 3 days. 2. Kuka syrup 1/2 teaspoon twice a day for 5 days for cough. 3. Cetirizine syrup in the evening. 4. Steam inhalations. 5. Sualin 4 times to resolve. 6.Zincovit 5 ml daily to boost immunity. Since this is a prescription medicine, I would suggest you to meet the local Doctor to confirm the diagnosis.