Venat had knowledge of an impending apocalypse that was set to kill a significant number of people and instead of speaking up in order to prevent it, she chose to remain silent. She was never operating in good faith. She even declares, quite openly, towards the end of Elpis that she was not going to simply go and speak to the Convocation in order to help prevent the Final Days.
Conveniently leaving out key facts, refusing to elaborate on the nature of the threat and various other factors further erode away the need for the Convocation to take her seriously.
To say nothing of the fact that if she revealed that knew of the Final Days in advance, she probably would have had some desperate mother who had lost her husband and children to a Terminus beast shove her to ground and crack open Venat's skull like a duck egg.
That's certainly a take on 'Flow' that I would have liked to have seen!
At any rate, deranged nutters that active allow disaster to strike their own society do not have much in the way of validity if they try to backtrack and demand to be listened to...after not simply being open and honest at the very start. (To say nothing of the fact that even her 'pleas' to the Convocation were based on falsehoods and beliefs that had no confirmed basis in reality.)
