I've seen the screenshot of the potty ladder and all that as far as Bella hiding a memory room for a lost baby but it has to be much more than just that. Whatever is in that room is so big even Jill doesn't know about it. A lost baby isn't exactly the worst thing that's worthy of such secrecy. If it is that, and/or a shrine to the hubby, I feel like that would be a compete downer and not worthy of the quality of this game.
Now, if there's something that proves Bella has a tie-in to Quinn or something, that would be epic. I only say Quinn because it just HAD to be Maya who found it, right? I know it's a long shot and I'm reaching but, whatever will be revealed behind that door next ep, it has to be bigger than "Oh, Bella had a miscarriage" or "It's a memory shrine to James and a baby because Bella killed them in a car crash" or something like that.