I got to ask, is there something special about the secret room (room marked ???) at Amy's place?
I tried to find answers but see none.
Also to all who are confused about Ellie's story and why they need to do Sophie's story first its because there will be an important part in there related to Ellie.

So in order to trigger it you need to use your PC at later time of the day (just click MC's PC at any time to see which one

).
I would also recommend reading all the dialogues in the game especially when interacting with other characters, many of them are to funny and it would be shameful just to skip them, not to mention there is lots of hints in them about current hidden and future events.

