Thank you for the input.
Sorry for the delay, there was a problem with internet.
Swelling can be then from an allergy
, insect bite.
Other possibility can be an infection.
You can apply ice.
Please do not apply it directly.
Apply it after wrapping it in a towel to avoid cold injury.
Motrin or ibuprofen
has antiinflammatory action which can help to reduce the swelling.
I would also advise to get an examination by doctor.
In case of infection, antibiotics can be required.
Steroid can be needed in case of allergy, bite.
I hope this information will be helpful.
If you have any query, please feel free to ask.
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Wish her healthy life.