I think it's clear that Rolling Stone engaged in poor journalism. They did not properly fact check, and the story had too many questions and holes to publish. Sabrina Erdely failed in her job as a journalist.
That said, I'm not convinced that Jackie fabricated this story. From my read of the situation, Jackie was hesitant to be featured in the article. There is not much upside for a woman to be featured in a national "rape on campus" story. You risk becoming the subject of internet hate and death threats in exchange for basically no personal gain.
It has come out that many aspects of her account were false. However, just because she lied about the details of the rape does not mean she was not raped, or sexually assaulted, or that something terrible did not happen to her. It's possible she lied about the location, the fraternity, etc., and I can see motivations for that: avoiding retaliation or attempting to remain anonymous. If you believe that she was raped or assaulted, squirrely behavior like that seems more reasonable.
Thus, it's very likely that Jackie lied about the specifics of the situation, but that something terrible (rape or assault) did happen to her. This interpretation is more in line with a rational persons motivations than inventing a rape story for unclear motives.
In a similar vein, I would recommend this This American Life podcast on the subject: https://www.thisamericanlife.org/radio-archives/episode/581/...