Not confused at some points with the translations but I really how she has a plan for revenge you're getting extra protection from the prince and accusing then of treason or something
wasn't the blue haired lady supposed to be smart? i mean, at least she shouldn't have had let her guard down this easily.... how was she able to manipulate others if she's this.. simple-minded?
Well, they said don't bite the hand that feeds you. But, haha, sucks to be you Leabric, played by her own disciple...
Leabric is clever, yes, very clever... But remember what goblin slayer says about goblin? "Goblin set ambushes, but never expected to be ambushed". That sentence fits this situation so well.
Remember, she has no idea the MC knows. Not just that, there really is absolutely no conceivable way for the MC to know about any of this- at most she should be slightly sus, if that. The MC is basically operating on cheat mode in terms of strategy.
Of course she would lower her guard at this point, she's right. The MC is just acting like she did the first time, when she really was just a stupid and naive girl, and there's no better disguise than reality.
Honestly, the only reason her plan didn't succeed was literally because of time travel. It required divine intervention to foil her plans, that's pretty good.