Half the fun of this is watching the revenge. If "Heroine" wasn't evil, what revenge would we have,
I haven't read the earlier chapters in a while so correct me if I'm wrong, but as far as I remember we don't know anything the heroine has done anything that warrants revenge?
If it ends up being one of those things where the heroine is trying to act out the scenes that ends up getting the villainess condemned without any real purpose other than "this is how the story should be playing out", then it's just gonna be a lot of "well actually I'm innocent and I didn't do any of those evil things you said" and we all know how those turn out. Sure she might get back at the heroine, but that's a far cry from the revenge she just took on her family who drove original MC to suicide.
Revenge to me is more like.. Out for actual blood, making sure that them and everything they care about is either dead or destroyed. Not winning in petty school squabbles about "well he said she said" that holds no real bearing on anything
Personally, I think it'd be much more interesting if MC ends up getting the heroine killed despite her being a good person, just to see everything around the first prince burn. Make him watch as his beloved has her guts ripped out. Would be a fresh take on the genre. MC does not need to be a good person-- she's out for revenge, not justice