I just wanted to share my experience. We had a very odd experience. When my son was about 2 he broke out with the red bumps. I took him to the doctor and was told it was chicken pox. He also had the vaccine. We treated it as chicken pox and it slowly went away. Well then 2 weeks later he broke out again. I took him back in and was told it absolutely can't be chicken pox, they don't return. We saw a dermatologist who swore it was flea bites. We have animals but I have worked as a vet tech and know flea bites. We still had the animals checked scrubbed everything in his room and even threw out his mattress and got a new one. The spots still continued to come and go. At one time it was so bad his entire body was covered so we went back to the doctor, saw the same dermatologist who said "There is no way this could be flea bites he would be living in a flea infested house." Out of desperation they gave him Zyrtec for an allergy and low and behold it went away. We never definatively figured out what the allergy was but I think he was ultra sensitive to the sizing in new clothes and I started washing new clothes several times before he wore them. We have never had the problem since. I think the biggest difference was that he really wasn't that itchy and I think with chicken pox they get really itchy. Just a story to let you know there are so may different things that could be going on and some times it is just a wait and see game.
Good luck I hope she is feeling better soon!