I could believe that, except that most of the sourcing was from Republicans who will no longer cooperate with her nor work with her; either ones in Alaska or former McCain staffers.
Granted, I only read the first two pages ... But the only negative 'sourcing' was from 'a close friend of McCain' ... The 'sourcing' with names attached appeared to be neutral in tone. I'd attach similar weight to an opinion from Hannity (roughly 0).