>>213877752She blew up too fast and let it go to her head. She was genuinely good in Winter's Bone, got noticed, got cast in the Hunger Games movies and suddenly she was a big star. She got cast in like 5 terrible David O. Russel movies so suddenly she was a pretentious art film actress even though she was shit in all of them. Then all that hype died and nobody wanted to hire her.
If she had a more gradual, natural career ramp up she probably would have been forced to actually become a better actress, take some risks, and could have had a pretty good career.