Hello, can you tell me how to brush children's teeth? My daughter want…

Hello, can you tell me how to brush children's teeth? My daughter wants to do it herself, I give her a toothbrush with a pea-sized amount of paste, and she eats everything but doesn't clean her teeth. Such spots are there, she won't let me do this, the mouth closes and screams like they're killing???‍♀️ How long should we wait until she learns to love it?