You might need to update to the new chapter 2 version because doing the message on the phone and after doing the major convo with Susan and letting Susan have her way with Rachel that same night Rachel was
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But before you move on to the new version try this.
1. Hear the message on the phone and follow through with it.
2. Go talk to Susan about Amy.
3. Wait till Rachel comes to MC for pleasure and accept it and this will allow Susan to have her way and clear the last notebook item.
Then that same night you should find Rachel masturbating but it may take 2-3 nights, this happen at 1 am.
Also you only need 10 hours of study to pass with flying colors.