Yandere acquired. And as she said, she would have forgiven him easily; we saw that in every flashback. It was literally the servants working against her desire (although technically for her own good, given who the real body owner was ingame)
I mean, yeah, it was obvious she'd forgive him instantly. What really bugged me is the maid getting off scotch-free, even if the original Diabolo was literally Satan.
That being said, Marron is in grave danger, isn't she?