The Saint’s Magic Power is Omnipotent (Light Novel) Vol. 9

AMULETS AND ADVENTURE Sei’s first journey abroad in this other world is to Zaidera and she’s trying her hand at making magical amulets! She’s also over the moon about her engagement to Albert.
While busy with wedding preparations, Sei overhears how one of the members of First Prince Kyle’s delegation to Zaidera is now bedridden with an unknown illness. Naturally, Sei can’t just stand idly by, and, with that, her trip to Zaidera is hurriedly assured.
However, upon her arrival, Kyle informs Sei that no one is sick and to make matters worse, the port has been closed, so they’re now stuck abroad!
Series Overview: Sei, a 20-year-old office worker, is whisked away to a whole new world. Unfortunately for Sei, the ritual that summoned her–meant to produce a “Saint” who would banish the dark magic–brought two people over instead of one. And everyone prefers the second girl over Sei?! But this is just fine by Sei, who leaves the royal palace to set up shop making potions and cosmetics with her newfound magic.
Business is booming, and this might not be such a bad life, after all…as long as her supposed Sainthood doesn’t come back to haunt her.