You should some self care measures like
You can give her Cetirizine/Claritin rather than Benadryl.
Also apply OTC 1% hydrocortisone cream on bumps.
You should give her cool compresses.
Wear cotton loose clothes.
Oatmeal bath and calamine lotion can be helpful.
If her symptoms 'll not improve over the time then consult her doctor for injectable medications including steroids for symptomatic relief.
In case of severe itching,cough,shortness of breath then visit ER.
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