J.K.
It is possible it is a viral rash in connection with a sore throat, but there is no way for anyone here to know. I'm stumped by flat eraser-sized dots though. Usually a viral rash is more splotchy or a series of tiny dots in clusters.
If she was given antibiotics for a bacterial sore throat, and the rash developed after she started taking them, it could be a reaction to the medication and require contacting the doctor again ASAP.