when I get in the her's room, black out,go again and speak with her
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If you have talked to her after the blackout, then you can move to beastboy friend event. It will trigger in girls hallway.
If you have missed any other events, just try walk around the tower in different times. Something will trigger. And the hints screen may misbehave sometimes (It will take few clicks to load the hints). click it two or three times to confirm, if it's empty