I mean sure the maid did do that, but to MC that happened to the OG villainess, not her, that maid was like her first actual friend in this life and now she’ll never have that anymore, she’s allowed to feel remorseful over a ‘what had been’ then to dwell on something that hadn’t happened to her personally because even though MC is inhabiting the OG’s body now she and the OG are ultimately two completely different people, as that’s been consistently stressed throughout the manga everytime instances of things the OG has down in the past are brought up and MC rejects these actions as choices she’d make
Honestly I hate the prince and maid. Like why are you crying for her she literally killed the other you. I sometimes hate mangas cause they always trying to pull a reason to forgive the villains. The prince is annoying and frankly should never be a King if that's how he rules by using ppl like chess pieces. He literally had no regard for her life just didn't want her fiance to retaliate. This is kinda wrong to say but I'm glad he ended up with the plain girl. Even though I love her and find her nice, she kinda fits the prince well as he doesn't deserve anything.