She isnt a buffoon, she is taking a gamble knowing she is taking a gamble and willing to do so.
She is in fact that powerful, if you want to argue she is "too drunk on her power" then explain how? She thinks she can power over any trap and that is true if its some kind of a ambush, in a fight she can win as the Gods even said as much, also at no point we had any indication they can do what they are trying to do, after all the Gods thenselves they cannot curse ... this is new, its not a flaw of judgement to not consider a ability they never displayed and one that they would used already if they could instead of the gamble.
Also we all know this wont work as, to the disappointment of Akane no Kill fans, this is not that type of series and after 130+ chapters wont suddenly turn into it, or at least its not likely so question is how this will play out since the the Commander Election is still up and its strange Ren asked Yuuki for his opinion and she is cleaver enough to know what Yuuki answer would be, chances are this because the issue at the Commander Ellection and Ren is using this to gather support for her re-ellection.
Last this curse cannot be "oh and everyone dies now" otherwise they wouldnt bother, it seems their plan rests of they taking it as if its the Mato power and then comes questions about it since I doubt Ren would take it as face value since she knows its a trap.