Westfall has been principal at the school since 2011. She was co-principal at Benton from 2007-2011.
She was an instructional coach with the St. Joseph School District for two years and a communications teacher at Lafayette High School for nine years.
Superintendent Melody Smith said in a statement from the district that she accepted Dr. Westfall's resignation with regret.
"Dr. Westfall has decided to pursue other leadership positions and I fully support her in her decision," said Dr. Smith. " Dr. Westfall is a strong instructional leader and she has helped move the District and Benton High School forward."
The District will post the position this week and begin the search for a new Principal.