A former child-welfare supervisor accused of criminally negligent homicide in the death of a 4-year-old Brooklyn girl asked yesterday that her case be dropped — claiming the law is being misused against her.

Chereece Bell, 34, has been charged in an unprecedented case with failing to prevent Marchella Pierce from being starved, bound and beaten to death allegedly by her mother, Carlotta Brett-Pierce, in the family’s Bedford-Stuyvesant apartment last year.

Bell’s lawyer, Joshua Horowitz, argued in Brooklyn Supreme Court that if the law is stretched to include anyone who handles high-risk cases, then any hospital staffer who loses a patient or police officer who fails to prevent a crime could be criminally prosecuted.

Bell and Damon Adams, the caseworker assigned to Brett-Pierce, are the first Administration for Children’s Services employees in the city’s history to be slapped with such charges.

The judge has not yet ruled on the arguments.