Parents of wavy/curly haired kids, I have a question

Currently trying to figure out how to best detangle and style 2.5 year old daughter’s hair and what the best products to use are.

She has big waves and curl patterns that easily knot through out the day (I have 2b/2c hair myself). I’ve spent a lot of money and time trying to figure out what brushes, detanglers, hair oils, hair mists etc. to use. Detangling or styling her hair is becoming something we both hate, I’m open to any advice.