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Poor girl Hazel! Over-the-counter benedryl can be given at 1 mg per pound, so she can have 90mg. Typically, the tablet is 25mg or 50mg, so you can give her a dose close to 90mg, rounding down. It may cause some drowsiness.
You're welcome. Please also monitor for facial swelling or difficulty breathing...if these signs are noted she will require additional treatment at the vet in addition to the benedryl.