(PORT HURON) -- A Michigan judge says he'll rule July 9 whether an Oregon woman will stand trial on murder and other charges after the body of her 89-year-old mother was found behind a thrift store. St. Clair County District Judge John Monaghan held a hearing Tuesday on the charges against Kelly Rhodes of Salem, Oregon. The body of Mary Grenia was found March 12 covered with a blanket behind a Goodwill Industries store in Port Huron Township. 49-year-old Rhodes was arrested March 20 in Belleville, Illinois. She's charged with an open count of murder and abuse of a vulnerable adult. Open murder means a jury can determine whether it's first- or second-degree murder.