We need the isekai for her inner monologues (≧∀≦)
I am pretty sure she rules her land using whatever knowledge she got from her original world to make sure her people live comfortably and the town prosper.
She is the Lord of that land for awhile already replacing her father. She makes laws, new business and other stuff. That's why she got lots of money.
But all those will be gone because the King of Her kingdom lost to the Empire.
That's why she need make sure not to lose her status to protect her family and her territory/people.
Because if she lost her status, someone else will be replacing her to rule the territory, and she worries that that someone will be a bad ruler who suck dry the people...
The story is great but I feel like it could definitely go without the isekai element. Like the plot stands on its own already