sadly, stories like this hate having actually evil ladies as love interests
Way more likely that the heroine's innocence (not the protagonist-heroine, I mean the pseudo-story heroine hooking up with the prince) actually is just pretending to be innocently-heroine-like and secretly scheming and evil ...
Not holding my breath for any villainous villainess, but something on the level of "The Story of a Villainess Seducing the Heroine", yeah, that'd be appreciated ;)