Behavioral Issues

My sister started a new job at an after school program, she works with two students that may need extra help or attention. One of her students has DS and is very good by herself but since another student is with them, the student with DS has become hard to manage and is constantly throwing items, yelling, and even hit my sister a few times. My sister is a bit frustrated bc she is not sure what to do as she doesn’t have special education training. Is there anything she can do to help the student with DS have a better time waiting for her parents to pick her up?