Hi, Welcome to HealthcareMagic Forum.
What other symptoms does your child have? Have you immunized her with all the necessary vaccines? May be it is a Macular rash
typical to Measles
which begins near the hair line and spreads to other parts of the body and normally fades in the same fashion. But you will have to get her examined by a Pediatrician
to confirm it as she may need Routine supportive care of maintaining hydration and anti pyretics.