They are really hitting the audience over the fucking head with the whole Dina Secretly Bad thing, aren't they. It's SO obvious that one might even think they are laying some double-secret trap of some sort.

.....but then again this is a japanese isekai author, shit multiplied by shit. So it's probably just... nope, she really is just "i was secretly evil and manipulating you all this whole time", that's it, and the author unironically thinks he's tricking people leading up to le gigantic tweest.