"I am Sarah, and nothing can take that away," The woman still said that she was Sarah.
Even though all the evidence was there and nothing could change everything, she still didn't understand. She has seen several police officers who walked into Dean's house. They came to the house because of a report from Mamoru to arrest the woman who took all of Sarah's data and was also Sarah's killer.
The woman saw the police were approaching, and she felt they would take her away so that she could not be with the children she wanted. She had sacrificed everything to live with the children and keep Mamoru in Sarah's place.
"What are you doing? I'm the woman who deserves you, not her," the woman said so she wouldn't be taken away.
"What makes you so sure you're better than Sarah?" Mamoru asked the woman back.