There are several stories out there about her firing/leaving
Elle, but I think it just boiled down to the fact that she was becoming more famous than the magazine, and other staffers (creative director Joe Zee and fellow PR judge Anne Slowey, specifically) were jealous. Hence, Nina is out, and Joe and Anne are starring in the new reality show
Fashionista, which basically takes
The Devil Wears Prada and turns it into a game show for prospective Slowey interns.
As for PR's move to Lifetime and how it affected
Elle's participation in the show, that had less to do with Nina than it did with Harvey Weinstein. Harvey decided that even though PR was his studio's only cash cow, he wasn't making enough cash from it, which is why he sucker-punched Bravo and skipped to Lifetime. Under the new contracts and free of the Magical Elves, Harvey has more direct control over things, and can broker new and more lucrative sponsorships and promotional tie-ins for the show. So suddenly, everything (prize sponsorship, accessories, hair, make-up, etc.) was going to the highest bidder.
Since Anna Wintour and
Vogue wouldn't touch PR with a 10-foot pole,
Marie Claire became the most logical fit (at least the one who would pay Harvey's asking price), and it probably helped coax Nina into deciding where to land after being bumped from
Elle. It just makes it easier for her to keep her chair by the runway, I guess.
BTW, I saw a trailer for the new Anne Slowey show, and it looks hilariously bad. I would get a small thrill if it was cancelled early in its run.
