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It sounds like she may have gotten stung or had an insect bite. These will frequently cause a mild allergic reaction of swelling around the site of the sting or bite. Usually in a case like that the swelling will resolve on its own but sometimes it will take some time for it to go down. Benadryl at a dosage of 1-2mg per pound will help reduce swelling and avoid additional allergy symptoms. Read more on insect stings here:
This is the most likely cause for the swelling.
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