I recently saw a post where children can get strep but it shows up in the sign of a rash around the neck and face.
That wouldn’t explain the body rash though 🤔.

Definitely do not just give her Benadryl. Someone said too, call her pediatrician first and see what they say cause they may want her to be seen and they will tell you what to do. Cause that almost ALMOST looks like hives. My older brother got hives like that when he was little from a allergic reaction to penicillin.

Could be an allergic reaction... Give him Benadryl