is this inappropriate for a mom to do to her girl?

I have a friend with a little girl who will be 3 in February. Her name is Bella, she has curly hair, but not too curly. It's about medium. Anyways, she straightens Bella's hair like 3 times a week because she thinks it looks cuter. Is it inappropriate to straighten a 2 year olds hair on a regular basis like that?