Clarissa was a member of one of the group of girls eliminated by Maxon at the beginning of his Selection. When he talked to them, getting ready to tell them that they were eliminated, she "flipped her hair." When the girls found out that were being eliminated, she "ran up to (Maxon) and clutched (his) hand." She was saying that she could improve herself. Guards took Clarissa away from Maxon, and helped her leave.
Clarissa was naive and over reacted when she heard that she has been eliminated. She was determined to prove herself worthy to the prince.