Thank you for the input.
Response to allergen varies from person to person.
Often the cause of allergy may not be determined.
Benadryl can help in allergic reaction.
You can repeat the dose after 6 hours.
Ice can be applied.
Local hydrocortisone cream can be applied if it is in a small area.
If the swelling spread inside the mouth, you need to take her to ER.
If it does not improve, oral steroid can be needed.
You need to consult doctor if the symptoms continue.
I hope this information will be helpful.
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Wish her healthy life.