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Hi. Welcome to JustAnswer. My name is Uzair.I am reviewing your post and will get back to your reply momentarily.
Yes, you are right this is most likely a form of allergic reaction and since benadryl is effective you should continue using the medicine and give her prednisone as well. It will get better soon. Nothing much to worry about as far as she do not have shortness of breath or chest pain.
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