Hi guys! I'm reposting my posts because I don't see it, hope its fine

Ok ... Is "input" means here insight or something else?
loath to widen the circle much? I don't understand what is the meaning of loath and also, I'm not sure what its the meaning of circle here, it's hard to know what they wanted to say with circle ...
"Hillary valued what her team had to say about all this, but
she didn’t completely trust it. They had no idea what it was
like to be her. Ambition and caution were the twin totems of
her psyche, and she was torn between them. She needed
more data, more
input, more advice—though she was loath
to widen the circle much, for fear of the story leaking."