Hair help!

Heather

My daughter is mixed,white and Trinidadian. Most of her hair is kinda like mine a finer texture but she has curls.

On the back of her head only she has a different texture, I've tried a lot of oils and curl creama but nothing really seems to help it not get frizzy. Right now I've been using Amla oil and Coconut oil it's kind of helping.

Any recommendations?