Okay so I was looking through curly products and here are some suggestions:

Ouidad has a Kurly Kids hair set (includes a light gel, conditioner etc.)
or you could use a low-poo/cowash for her and try using Carol's Daughter hair milk for her- they have a light version and the original- I heard its very good and looking at her hair it sounds absolutely perfect! If your in need of hair washing/care products I would reccomend the Ouidad stuff.

Also why not try a vinegar rinse?
LP: SM RSB
Co-wash: NH IH&T
CO: SM RSB, SM SFC
LI: a CO, KCKT
Sealers: an oil, SM Elixir, JC N&S
DC: SM Masques (the vegan ones), DIY
Stylers: *just CO usually; KCCC, FSG, Aloe
Clarify: ACV, Lemon-Aid

Oils to seal, RO, and/or pre-poo as needed

2c/3a/3b Coarse,High Porosity
CG since 2007