I think there were so many factors that made her decide to leave the modeling (remember that she said that Vs had asked her to lose weight, since in her initial years in VS she was very thin compared to the last year )
Not only that, I think I make bad decisions, bad friends, who knows?
from my point of view she had a decline of not knowing what to do with her life, she was young, she had money, but she made bad decisions, there was perhaps someone who advised her, she invested the money in something, she created her own business.
Before VS, she had a "quiet" career, had a couple of parades, had a couple of unknown campaigns but had, when she joined VS and became an angel, she had a stop, where she started to have different jobs (but different from other models, she did not know how to take advantage of it at all) I think that was also an important factor.
There was a lot of competition, models that scale, struggle to have a place in modeling, she did not know how to make a good decision in her career, we know that her last photos with SI 2016 (?) were bad.
I hope she can settle down, and be able to do something with her life, that she can move forward.