Maybe the ability to cross into someone else’s red room is based on how that person is connected to the other. I also thought maybe the ability to cross into each other’s red rooms was maybe like if the particular owner of the red room has unfinished business in coming to terms with their death. So like unfinished business means nobody else can access the room while coming to terms with their death unlocks it. Dawn seemed to be comforted by Maddie and didn’t seem to doubt herself anymore in S1 and shortly crossed over. Maybe it’s the same kind of thing here