The disloyal staff- Detective Riddle

A wealthy woman lived in a completely circular home. One morning, she is found dead in the front yard. Detective Mehul comes along and asks the staff questions. The driver says he was washing the car, the maid says she was hovering in the corners, and the cook says she was preparing lunch. Who is guilty?

 The driver says he was washing the car.
 The maid says she was hovering in the corners.
 The cook says she was preparing lunch.

• The driver
• The maid
• The cook
• none of them

The maid