L.S.
That sounds like cradle cap. If that's what it is, just keep baby oil or preferably olive oil on her head after bathing, then use a baby brush to try to gently remove the loosened scales. Also, and not to scare you, but my baby had this rash all over her face and neck. It went away with a prescription of Lotrimin from her doctor, who said that it was just a heat rash. We later found out that she suffered from eczema. Eczema isn't that hard to treat, but is very miserable for the baby when not treated.