My son got hives when he was 11mths old...and yes, it scares the jeepers out of you. I dashed straight to the GP and within seconds he was being looked at by not 1, but 3 doctors. They monitored him for a while, and just said he's had an allergic reaction to something. (i reckon it was soap...but anyway). So i can understand how frightening it would have been pulling off her onsie....they look awful dont they?
I hope shes on the mend..