S.L.
One of my daughters had scarlett fever when she was 5 years old and this sounds very similar but I don't think the rash kept spreading, was mainly on the trunk of her body, and yes, the fingers and toes peel with Scarlett Fever. She was very sick for some time even though on antibiotics and this can affect the heart and other side effects so I would take my daughter to the doctor for a complete evaluation of how she's doing with the strep and rash and Scarlett Fever right away. It is a serious thing and not something to mess around with.