E.B.
You need to take her.
It actually sounds a bit like hives..Which means she could have gotten into something she is allergic too.
We have had a HORRIBLE FLEA issue at our house this summer.
My kids normally have them on their ankles, legs and in their middle more around the waist line.
They normally only are red for at the most a day. Flat and about the size of a smaller pearl. They normally on my kids are almost flush with the skin..meaning not a raised bump. just red. I dont know if that is typical of flea bites though.
At the very least call and talk to a nurse at the doctor's office. At least they can give you a professional over the phone opinion.
if she has any puss or fluid that seems to be in them TAKE HER NOW!