Sagesumareta Reijou wa, Daini no Jinsei de Akogare no Renkinjutsushi no Michi wo Erabu - Yume wo Kanaeta Minarai Renkinjutsushi no Daiippo

Mia works at the guild’s front desk and is about to retire for her wedding, when she catches her fiancé cheating. After breaking off the engagement, she’s offered a surprising new role: assistant to the court alchemist. With that chance, Mia embraces a second life and sets out on the path she always dreamed of — as an alchemist. A former noblewoman reborn into a role of power and skill, she begins to create, learn, and shine on her own terms.

https://www.cmoa.jp/title/336969/