We've just had Sam down with something similar last week.

Nappy change at lunch time and he was all clear - 4 hours later at the next nappy change he was covered in a rash of raised red spots. Add in nasty fevers, runny nose and being completely off his food... We took him to the GP, she was pretty confident it was just a viral rash, checked his ears and throat and found a very red and inflamed set of tonsils... Came back the next day and he was already picking up and seemed better.

I was completely freaked out as I have a lowered immune system and was going away (without Sam) for the weekend and was petrified we'd all be put into isolation with something horrible - but he's fine now. I never even knew that viral rashes existed until a couple of weeks ago when Sam was again sick (but with more of a snotty, tummy bug thing), but this one looked scarily like measles which was why I was so worried. Thank you for nothing, google images!

I hope your daughter is well soon!

BW