Best anti dandruff shampoo for DD9

[Candlelights2345]

My DD has a case of dandruff and the usual head & shoulders and vosene hasn’t cleared it. I’ve never really had this so don’t know what else to try.
I had a quick look in boots yesterday and there were quite a few shampoos around £7. This more than I’d usually pay but I want to but wondered if anyone had any recommendations please?
We wash her hair every other day as it goes worse if we leave for longer.

My DD also 9 has suffered with a dry scalp for ages, I’ve tried them all but at the minute I’m finding the Superdrug own brand trichology shampoo is fab

I got nizoral for ds aged 9. After a few uses and it cleared the dandruff - need to follow instructions for leaving it on for a few minutes after massaging in. I now just use it on him periodically, with head and shoulders in between

Thanks I’ll take a look in Superdrug tomorrow for these.