D.B.
I hope it's not scarlet fever, J.. My little sister had that when she was 5. Her doctor missed the strep diagnosis, so she wasn't treated with antibiotics, so she got scarlet fever. Her skin sloughed off - she truly looked like one of those zombies, and it was scary. It also affected her joints and she couldn't walk for a week.
I was in college, and my family brought her to my senior concert without warning me about what had happened. (They didn't want to worry me.) She was well by then, but it took a long time for her skin to heal. I'll never forget how bad she looked. And she was very, very sick.
Make sure you get her into the doctor. They will want to check her over.
Good luck,
Dawn