Claire Sullivan doesn't like being alone with Serena Sullivan, doesn't like looking into Serena's eyes, and especially doesn't like being mocked by Serena until she feels unsettled inside.
She is Serena's mother, and everything she does is for the good of Serena and this family, so she isn't wrong.
"Ethan Grant? Don't forget how you married him! And don't forget how The Grant family came to The Sullivan family's door and humiliated us!"
"Claire Sullivan!"
Serena Sullivan raised her voice, looked up coldly, and retorted, "You don't need to manage my affairs."
"You!"
Seeing Serena not listening at all, Claire Sullivan's face turned red with anger, "I am your mother, and I have the final say on this matter."
Now she remembers she's her mother! Serena sneered, calling out to the security guards at The Grant Corporation's entrance, "Keep her away."
"Serena!"
Being driven away by the security, Claire Sullivan felt humiliated.