The woman, identified only as R.M., denied the charges at a hearing Monday, Gulf News reported. Her husband, A.F., is charged with aiding and abetting her actions and also denies the charges.
An evidentiary hearing is scheduled for July 1.
The surviving maid, a 29-year-old from the Philippines identified as E.K., told police she and her colleague, an Ethiopian, were beaten and given inadequate food. She said R.M. sometimes used bizarre punishments, forcing them to drink bleach on one occasion because she was not satisfied with the way they cleaned the bathroom.
A forensic examiner found evidence the Ethiopian woman had been systematically tortured and was denied medical care.
"The fact that she was made to drink a pesticide quickened her death," the examiner said.
R.M. has been jailed pending a verdict while her husband is free on bail.
Notable deaths of 2014 [PHOTOS]