There are a couple different ways to grow dreds. These look like she had a hair studio do them and said "leave the front straight" for some reason. Another way is just living hard on the streets for a couple years ("driven from human society" if you want to get Biblical) in which case the front would tend to form skinny dreds.

My favorite was this punk guy who just wore a cap ALL the time and never combed. For months. I saw him take it off once and his hair was like one huge dreadlock mat.

edit: this is not to imply that all people with dreds are shallow or homeless or gutterpunks, it's just a hair style, I've known people in academia and corporate jobs who had them.