Answer:
Social bullying
Explanation:
Social bullying is about consistently one person is revealing secretes and images of another person to spoil her/his image. That social bullying hurts his/her image.
Thus here in the above statement when Sadie feels jealous and angry, she started social bullying to Emma. She contacts friends and tells the secretes about Sadie and told that she cheated me, she cheated teachers, etc. She spreads a rumor about her that she sneaks out at midnight with boys who are druggists. It damaged Emma's image. Thus Sadie used social bullying for Emma.