I would not characterize them as mistakes. She is an extremely talented person. IMO, once again it's Tim. He is trying to elevate Apple to a level it will never be. Her hiring and strategies have all been moves to try and increase profits to shareholders by creating a false appearance of exclusivity. The AW is a failure, and will never recover until it becomes significantly more autonomous.
I kind of feel bad for her. Inside I think she knows it's impossible. Her issue is dealing with a COO pretending to be a CEO. Apple has lost it's Soul under Tim, IMO.