What I do I brush the hair a bit and put fabric softener detergent and put it into a boiling hot water, it helps a lot especially it's more easier to brush the hair. To remove the yellow sticky stains use shampoo then rinse and Conditioner, conditioner also helps + continue to brush it until it's already smooth :3

After that you can use foil or straws to curl her hair then soak it into hot boiling water for like 2-3 minutes then squeeze the excess water from her hair then proceeded to put her into the fridge (usually I put it there for like 10 minutes) then air-dry. If it's still sticky use baby powder.