Why Meg Whitman failed

There is some media coverage Why Meg Whitman failed. When i read d article, I wondered: did anyone in her team have any strong incentive to tell her about her mistakes during her campaign? I expect there must be some incentive to help her win, but perhaps there was a stronger incentive to just take her money (big money at $140MM) and not care about the result.

How can leaders avoid this situation?