Soo S3E4 the Exercise convention: what actually happened and what didn’t?

Right before her binge, she seemed to have a bender with the Zooey character but it was all kind of trippy. I couldn't tell who or what was real and what was imagined.

Why did she model on that runway? Why did she take off her clothes?

I think she relapsed because she was so ashamed but this lead up was so blurred and confusing to me. I think it's meant to be this way so I'd love to hear y'all's interpretations.