Konyaku Hakisareta node, Kuni no Hazure de Renkinjutsu-hime ni Narimashita! Jiyuu ni Natta Totan, Ringoku no Outaishi ya Seirei-ou ya Ryuuzoku kara Aisareteimasu

Elise is the daughter of a frontier count who has been given the position of alchemist. The crown prince breaks off the engagement, saying, "A daughter from a humble profession and a frontier background is not suitable for the queen. The shock of this event brings back memories of her previous life, and she comes to her senses about her unreasonable treatment and realizes that she has no more regrets. Elise decides to return to her hometown where she has left her secret feelings behind. She begins to learn alchemy, and the crown prince of a neighboring country proposes marriage to her...!? Source: MU