I would give the sleep cap a shot. If she won't wear it or if it comes off at night try a satin pillowcase. Pineapple her hair too. Should help with the tangles
Katie
2C/3a, Medium Texture, Normal porosity, High Density, Normal Elasticity (so says the LCLF Hair analysis)
Co Wash: As I am
RO: Yes To Carrots / Ion
LI: Biotera / Samy Big Curls Defining Cream
Gel: FSG, Volumax (Original and Mega)
Color: Henna
Tools: Diffusing