I think b/c she has so much length to it the heavyness weighs it down. Also she adds alot of her product to her hair. The Detangling Oil she uses is somewhat heavy.
I have heard on other boards that natural hair first starts to grow outward then when you get more length it grows downward. I didn't do a big chop so my relaxed hair I guess was always pulling my hair downward...and then the products I apply keep it under control too!!