I'm thinking of taking money from my neighbor after she died
Why do you want her money?
After my grandmother died, she bought her house and lived in it for years even though I wanted it. My grandmother was an outcast so no one fought for her.
While it must be nice to have money, stealing it from the dead would be considered a horrible thing by most people and if anyone finds out could spell the end of your social life. Do you want to become an outcast too?
Nah, she can afford to lose some of her money. She was rich.
You should respect people who have died. If you owed her money the loan has died with her legally other than that leave her family to divide the assets.