Marriente should have used second chance when telling adrien the truth in the London special
What I mean is that she should have decided whether she should tell adrien the truth after she restored the miraculouses back to their orignal form, this way when it comes to tell adrien the truth and thus then ladybug could have unified the snake and ladybug for a second chance. Then tell adrien the actual truth to adrien that Gabriel despite being a supervillain tried to be a good father but failed to, if adrien can’t handle it second chance and tell the fabricated truth. Infant marriente had multiple opportunities to borrow the snake miraculous just to see if adrien can handle the truth but she doesn’t even try