Zebley was appointed as a State Trooper in July of 1992 and, following completion of her academy training, she was assigned to Troop 6 in Prices Corner, New Castle County. She graduated from the Northwestern University School of Police Staff and Command in 2000.

A 28-year member of the DSP, Zebley received her Master of Science degree in Administration of Justice in 2003 from Wilmington University. She also become an adjunct instructor that year, and a program assistant in the University’s Criminal Justice Program.

Zebley continued her professional development as she worked her way up through the ranks of the DSP. In 2008, she became a graduate of the 235th session of the Federal Bureau of Investigation (F.B.I.) National Academy. In August of 2019, then-Major Zebley was promoted to the rank of lieutenant colonel by Superintendent Colonel Nathaniel McQueen, Jr, signaling her selection as his apparent successor.

Zebley now serves as the Police Superintendent for the Delaware State Police.