I'm looking for this manhwa that has the FL where I believe they are isekai'd. She was acting as this nobles daughter, but she knew the real daughter would return and take back her name and claim the FL achievements as their own. The FL makes a contract with I think a duke? Anyways I remember the soil was not very good in the dukes territory, so she is helping with that. I know later on the FL is visited by this fairy who she used to be in contact with, but the fairy still cares about the FL. That's about all I remember about this story, please help me .
I'm not sure but it sounds for me like a mix of the plots from "Death is the only Ending for the Villainess" and "Koushaku Reijou no tashinami".