If you want the Sabrina interaction and it isn't working, you need to delete your save and start again. There is something in v0.1.0 stopping the interaction from working if you have a save from a previous version.
I've looked through all the comments about Sabrina, I've done exactly as you've told everybody.
1. Interact with the note on the front of the house.
2. Start a contract at Luna's House.
3. Exercise the ghost.
4. Go to Luna's Room.
I entered, she wasn't there. So I left, waited like 10 seconds and went back in and she still wasn't there. I've tried this multiple times but no matter what I do, she never appears. What am I doing wrong?
I am using the cheats to speed up the contract, does that maybe somehow disable or break the interaction?
EDIT: I tried it without any of the cheats enabled, still didn't work. I'm going to try it on a fresh save, maybe having save data from a previous build of the game is causing the interaction to not work?
SOLVED: After deleting my save data, fully from the folder, the interaction worked. There is something stopping the Sabrina interaction from working if you're playing on a save from a previous build.