9 year old virgin red hair

This is my daughters 9 year old hair. It is incredibly thick, and she never has dyed her hair. She has curled it once for a wedding, but that is the only heat that it has seen. She swims about once a month in JUNE, JULY, and AUGUST, but not much other pool exposure. She uses Shea Moisture Carrot Shampoo and Conditioner , and sometimes the corresponding conditioner. Hair is frequently just worn down, but we will braid it sometimes. When she was a baby she had ringlet curls, but as her hair grew the curls went away. (I don’t know if it was because of the heavy weight of her hair, or something else, but her hair is now straight)