Kaifukushoku no Akuyaku Reijou

Charlotte Cocoriara: duke's daughter, fiancée to a prince, villainess, and...NPC? Framed as the villainess in a spin-off of an MMO dating sim, Charlotte suddenly regains memories of her past life as a player of the same MMO. Armed with her new understanding of the world, she happily accepts the end of her betrothal and her accompanying exile. Who needs a cheating prince fiancé when there's a whole fantasy world to explore? Using knowledge from her gameplay, Charlotte strikes out on her own. Her first task is to switch jobs, something apparently no one else in this world knows how to do. With her new role secured, she'll make friends, join parties, challenge dungeons, and...! Follow Charlotte as she sets off on a grand adventure, free for the first time in her life!

(Source: J-Novel Club)