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hello , if you feel it is an allergic reaction you can give benadryl and I will direct you to a site for dosing on this. If the Benadryl doe not help or you notice difficulty with breathing she should see an ER vet. Even when a Vet office is closed there is usually someone on call that they will direct you to.
Benadryl usually comes in 25 or 50 mg tablets so be sure to get what is right for her body weight and do not get the allergy/sinus, just plain Benadryl