Based on the same friend’s publicist at her publisher, a literary imprint at one of the big ones (she thinks this person is excellent) — the job involves managing author events, tours, media opportunities, reviews, prize entries, sometimes travelling with the author on tour.
At a lower/assistant level it might involve making travel bookings for a tour, admin support, sending out book mailings to reviewers, logging press coverage, review clippings etc. At a higher level it will involve being responsible for an entire high-profile publicity campaign, trying to figure out an angle for an author who may not know what to say about themselves, managing relationships with publications, festivals etc. (My novelist friend has definitely been asked in advance of ‘in conversation with’ type events if there are questions or topics to steer clear of.)
I would imagine the appropriate publicity person at PRH would certainly have been active in promoting links back to the book when the film was released, doing stuff like making sure a paperback TSP with a film still cover was released at the right time (I noticed that my Kindle copy spontaneously switched to a film still cover) and coordinating SW’s appearances in film publicity/at the premiere etc. I imagine that the CH story meant that finding a US distributor became impossible, so the campaign halted when it would usually have had a big new push there, with SW and the actors teaming up for media there. Don’t know what’s happened in other overseas territories.
But ironically, on the basis of any publicity being good publicity, the CH story may have bumped sales.
Remember that the PRH person works for the publisher, not SW.
Her agent (who gets a 10- 20% commission of SW’s earnings from royalties, advances, film rights and any other sales she negotiates) will deal with any conflicts with the publisher. That may be one of the things that’s going on, and/or acting as an advisor to SW about happens next, if anything, and possibly doing some developmental editing on a rewrite of OWH, if that’s what’s happening. Agents can absolutely be involved in promotional efforts, too, but at the moment there’s nothing to promote.