Was she? No, not really. But she wanted to be sorry for it. She wanted to be the kind of woman who would feel genuinely bad about what she'd done and regret it.
(She felt genuinely bad about almost everything she did and regretted it all, but that wasn't the same as feeling those things about this specific action.)
Saint Mary Magdalene, Apostle to the Apostles, Beloved of Christ - that was a woman that should seek to make amends for the harm she'd caused.
Mary wished she knew how to be that woman who would make Him proud, how to be that woman she was meant to be. She knew didn't get to be her by coming around here and encouraging violence with Judas, no matter what his crimes were. She was supposed to be above judgement, supposed to be better than that.
But was wasn't, and she never would be.
Eventually, after a long time on silent thinking upon her own sins, Mary drained her glass and said, "no," not clarifying which question it was an answer to.