Colleague is overly dedicated to job

DEAR HARRIETTE: A woman at my job has been giving me hell. She works nonstop. She’s often sending emails at 9 p.m. or 4 a.m. — and she actually expects a response! Recently she chewed out one of my colleagues because she requested something at 6 a.m. and didn’t hear back until 8 a.m., which is still outside of our normal business hours.