Why didn’t Zoe just leave?

She was there for three years, right? Why didn’t she, at any point, leave the mansion to walk to the nearest town and get help? Like, notify the authorities about what’s been happening there. She lived in the trailer, so she could’ve easily gotten out. If Ethan was able to get inside the residence so easily, then surely she would’ve been able to leave, especially considering that she had lived there all her life and knew the place well. So, was it ever explained why she never left?