Author POV,

On the other side, Carol laughed there and said yes to the professor at that time because she was very happy right now because she had finally found out the whole truth and succeeded in her purpose....

She did not even notice at this point that who could do harm to her....

She was so happy at that time because it was now possible for her to reveal all of James's details and his real identity to Emma.....

But she had to bring Emma to the library once because she could not take pictures of the truth...that means that book where all the truth had been written....

So,...