M.H.
What did the doc say about her turning blue?
My daughter was diagnosed at the doc with roesola, but it turned out to be hand foot n mouth.. a few days after we took her to the doc, the bllisters on her hands and feet were evident. and that is what was going around her daycare at the time.
Not sure if they can get roseola twice or not, but hand foot and mouth would explain the pain in her mouth.
Good luck.