I'm not sure she'll actually get the job. We knew she (along with D'Amaro–sorry
@Sirwalterraleigh) were being considered. But they were also considered to be not-quite-ready (hence ol' Iger coming back).
I've noticed a common storyline in lots of "news" articles about this: that Iger was never really a huge fan of Chapek or sure about his readiness to lead the company. This seems strange to me, since I was under the impression that Iger picked and promoted Chapek. Maybe it's just spin-writing a new narrative. But interesting nonetheless.