Well, obviously she was the best person, otherwise they would not have hired her. The definition of "best" is malleable. You may not understand the reasons why they chose her, but clearly they had them.
No, based on the evidence she seemed to be the best person.
I don't have much of an opinion on what exactly happened, but your claim there is overly confident.
And yes, they may have said "she is the best", but that doesn't mean they actually got that right.