I would say that she turns bitter and tries to pin blame of bullying and harassment onto Yulia, because that's how these "protagonists" are
but would she still end up with Yulia's ex fiance?
Most likely not, judging by Chapter 4, because she will be pursuing the prince as she may think that "the publishers got my destiny wrong. I'm supposed to end up with the prince!" And as these stories go, Julia (is it her name? idk I call her Bitch-chan) will do something outrageous, and either gets stripped of her newfound nobility, joins hands with the evil kingdom or some shit, or is sent to the dungeon and dies.
Honestly, I can't read everything in Japanese, and I can't find raws, so this is all hypothetical. I do not know what will happen, and I am basing my theories on common tropes and instinctive decisions.
mmm, yeah true
Since super optimist, stupid girl over here, Julia, is following how the book goes and is in love with the prince. How will she react to the ending of the book? I mean especially since it is going to be chanced to her crush ending up with Yulia her so called rival/ villain.