HI, thanks for using healthcare magic
A swelling that is found just under the ear may be a inflamed or infected lymph
node or related to the parotid gland
The parotid glands are salivary glands found between the ear and the jaw. They usually do not cause any problems but very rarely can become infected or blocked.
If the use of the oral anti pyretic medication causes the temperature to fall and her symptoms do not worsen during the night, you can consider taking her to the doctor in the am.
If your doctor has an on call service, you may want to consider contacting them, he or she may be able to see you prior to the morning.
I hope this helps