Two different textures hair on my 9 year old kid. Did it eventually evolve into one hair type?

I’m looking for experiences from other people. My 9 year old daughter has two very different hair textures on her head: she has tight 3c curls in the front, but the hair at the back is almost completely straight with just a slight wave. She used to have 3c curls all over till age 4, but that has mostly grown out except for the front.

It looks a bit unusual, and I’m wondering if there are others whose children went through something similar? How did your child’s hair develop during puberty? Did the two different textures stay, or did it eventually evolve into one hair type?

We don’t have a routine