How is it our looks can change over the years and go from looking like one parent to completely looking like another?

I’ve noticed lately how many people looked identical to one parent as children and changed as adults to be identical to another parent.

I knew this little girl that looked nothing like her mom for many years. She looked exactly like dad. Even her baby pictures to teens looked like pictures of her dad at the same age. Nothing like mom. Then recently I’ve seen pictures of her grown, and she is the splitting image of her mom only of course a younger version. Though, funny enough, if you had a younger picture of mom at her current age, she looked different. So it made me wonder. Is it exactly genetics or is there something else at play?