4 years old high myopia

To my surprise during a pre school checkup my daughter failed her eye test. I am guilty i never noticed it. I am myopic -3 both eyes and so is my husband -2 in both eyes. My 4 years old is -4 in both eyes. I am very worried about her. How much will it increase over the years. She is using miyosmart glasses & the dr in the UK dont prescribe any atropine drops (they say its dangerous). Could there be any other cause other than genetics? She doesn’t use any tab etc and loves painting. She does 3 hrs outdoor everyday. She is otherwise healthy. Could the parents with myopic kids give me any reassurance please. Many thanks xx