The Sixth Companion for the Heiress

Veronika lost her job and the man she loved, but somehow—by some unknown means—she ended up in another world. Only her soul ended up there. And now, together with the countess whose body she has entered, she will try her hand at the role of an artifact-maker, the companion of the energetic daughter of a duke, and then—eventually—the wife of that very duke.

Just need to hope for the best, because the worst will find you itself.