Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain a marble sized moveable lump that is not painful along with having
fever due to viral infection can be due to swelling of the
lymph nodes secondary to infection..
As lymph nodes are draining sites, therefore they can get swollen and infected secondary to infection..
I would suggest you to do warm compresses over the lymph nodes..
Give
Tylenol or
Acetaminophen to your daughter for relief from fever..
Give her ample of rest and a nutritious diet..
Feed her with ample of fluids..
In case if fever does not subside in next one week more consult an Infectious medicine specialist and get her evaluated and investigated for possible causes of infection..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.