I just guessed that in the sentence (2), “it” is a dummy-it, and to~ is the real object. So it means, I wouldn’t say it’s not the Lorna’s nature to deny all knowledge of this plan.
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eipjoo-
(1) “Do you really think he'd go off with another woman?” “I wouldn't put it past him.”
(2) I wouldn't put it past Lorna to deny all knowledge of this plan.
I just guessed that in the sentence (2), “it” is a