18mth old has very dry scalp - what can i use?

I use organic coconut oil, I gently massage it into her hair, I also do not wash her hair more than once a week (usually I have to because something is in it) Immediately after the bath I apply the coconut oil and massage her whole scalp.When I noticed cradle cap when she was a baby I used olive oil but I switched to coconut because I prefer the smell! Good Luck.