Can a schedule 2 narcotic such as MSIR be left in a in a patients room?

I work at a nursing home in the state of Maryland. Recently the grandfather of our DON was admitted. Over the course of the weekend the patient was given an order for MSIR 50ml q1h. During all this our DON stayed most of the day with her grandfather. While she was there myself and the other nurses on staff at the time whitened her remove a fresh box from the med cart and take it to his room. And that is where it stayed for the duration of her stay which was about 10 hrs. My question is it legal for her to take and administer the MSIR to her grandfather while not on duty?