Best options for curly hair?

I have asthma triggered by fragrance, and as a result my wife and I are struggling to find decent haircare products for her curly hair. My hair is 1A, so my own hair products don't cut it for her. Does anyone have any product recommendations? We are in need of:

• Shampoo
• Conditioner (or mask)
• Leave-in conditioner

We are good on scalp serum (subbed with plain argan oil) and curl cream (Not Your Mother's) already.

Thanks in advance for any suggestions!

Side Note: Why are fragrance-free products so expensive???