Hi. You may try SebaMed Children's shampoo. Use daily initially for a week. Brush her hair before shampooing so that the flakes get dislodged. Once the dandruff reduces you may use it twice a week.
Not sure about use of VLCC dandruff shampoo in kids. You may take a dermatologist opinion on it.
Health Tips
If dandruff doesn't come down within 2 weeks, meet a dermatologist for medicated shampoos.