A judge has declared a 15-year-old Michigan girl competent to stand trial as an adult on charges of poisoning her grandmother.

Kristina Adkins faces an April 15 preliminary hearing after the ruling Monday.

Defense lawyer Michael McFarland says he will petition the court for an independent psychological review and may pursue a battered child syndrome defense.

The medical examiner says 53-year-old Virginia Bentley died from an allergic drug reaction to morphine sulfate in August 2006. Adkins is accused of taking the drug from her grandfather's medication and mixing it into Bentley's medicine.

The girl was living with her grandparents at the time in Rollin Township. She was charged in December with murder and poisoning.