Lessons from Katie Cotton, Apple's Departing PR Boss
blog.hubspot.com
blog.hubspot.com
The article speculates that the low-key PR campaign was itself part if the mystique, but it's easy to overestimate that. The truth is that playing hard to get only works well if you're hot.
This is not to downplay the crisis management and other things mentioned by OP. She was/is apparently quite skilled at her job.