Does she need shampoo, could you use a cleansing conditioner? These are better for detangling hair. Tear free shampoos are on the neutral to alkaline side which is not ideal for keeping the cuticle flat on hair, for slip or aiding detangling.
Some people also wash their little ones hair with them laid on their back on a towel, hair over the sink; otherwise there are also guards that fit around the hairline to stop bubbles getting onto the face.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics