After you confront the first person successfully, it will update their statement. That statement now conflicts with someone else's statement. Confront the next person with the updated statement. And so on :)
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Warning spoilers ahead
Have you talked to Dhena to unlock Ami's room? If so have you reported back to Morgana? if so have you confronted Dhena about Ami's book? If so have you confronted Erica about Emmet? If you've done all that then confront ard, and then Hannah. You will also have to talk to ami a few times can't remember when.