Marline Yann Long Hair?

When I watch "How to Be Indie" I always look at Marline Yann's hair (Abi) and in the episodes her hair is just shoulder length; but as I looked at a new episode it was sooo long, what do you think she was doing to her hair? Is it extentions? A weave? Or does her hair grow really fast? It was just a few inches above her bellyon. Do you have any tips on making me hair realllyy long - my hair is shoulder length, how long will it be next year in december?