D.K.
Hi J., unfortunately, I have experience with MRSA. My step-son brought it up with him from Florida this summer and my baby caught it. I was pretty ticked to say the least. (every time he comes up he brings some sort of infection that gets the baby sick) Anyways, tell your doctor that you want an oral antibiotic. I can't believe they didn't give you one already. My 1 year old has already been through two rounds, but it was because the pharmacy fouled up the first time and didn't give us enough. As for my step-son, we had to have him soak in a epsom salt bath twice a day for 20 minutes as well as use the antibiotics to draw the infection out of his bumps and dry them up. I also recommend thoroughly scrubbing all of your daughters toys with a strong antibacterial cleaner and wash her sheets and pillow cases with hot water. I also shampooed the areas of the couch and other furniture that my step-son came in contact with before we knew he had it. Once we knew what it was, we had him wear pajama pants to cover his bumps and prevent spreading the infection around. We did this over band-aids on the worst of them. It's double protection. Even with all of that work though, the baby still caught it, I think because we initially thought the bumps were a really bad case of his eczema before they developed heads.
At any rate, go back to your doctor and demand an oral antibiotic if your daughters bumps don't get better. The cream isn't enough, the infection lives inside the mucous membranes and only an oral antibiotic can get rid of it. If it makes you feel better, my little one hasn't had a recurrence of the bumps since finishing his second round of antibiotics. Good Luck!