I don't know if there is a 3rd room, but I the door on the left after Filian didn't let me through. Also, I talked to everyone in the 2 rooms I do have access to, but no progress seems to happen, no matter how many times I talk to them.
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There was meant to be a third room, but unfortunately I could not finish it in time.
Once you all dialog options for Ellie, Camila, Anny and Filian are exhausted, a message is supposed to pop up, letting you know that there is no more content in the game. I don't know why you didn't recieve it, it might have bugged out - but if you talked to everyone, then you already experienced everything there was to experience for now. It is admittedly not much - I severly overestimated how much I could get done in 72 hours 😅
Anyways, thanks for playing, and for the feedback!