It's hard for me to know exactly without knowing your DD's hair properties, (coarse, fine) but the one specific product you mention, coconut oil, may be negatively affecting her if she has coarse hair (like me). I would switch to maybe something like grapeseed oil or something light like that.
Coarse = protein sensitive = no like coconut oil.
Now my DD hair was breaking, she has fine hair. I had to up her protein.
Hope this helps.
3A, Protein Senitive, Low Porosity,
Wash: Suave Naturals Conds (excluding Coconut), CVSB
Rinse out/Leave In: GVP Cond. Balm, KCKT,
Style: Naturelle Gel(winter HG), KCCC (summer HG), Flaxseed gel
Love your hair: Love yourself!