I'm sure that Stern wasn't allowing anyone that room who could possibly talk to Anna, such as the maids. Basing this on the theory that she was being held hostage there because she wanted to call for help to get free from Stern.
Which is why i wonder about the phone situation. Did she have her cell phone? Did she make any calls from the phone in the room? I do remember a friend (well a woman who claimed she was her friend on CNN via phone just hours after Anna died) saying she spoke to Anna while she was in FLA and Anna told her that she wasn't allowed out of the room. That could be a statement by Anna that she was being held hostage or maybe she was so drugged she didn't know why she wasn't allowed out. Probably someone was standing over her listening to what she said to make sure she didn't say something wrong. But in that interview I remember distinctly that the "friend" said nothing about Anna being sick. In fact, she said that Anna was complaining that she wanted to go out.
One of the many suspicious statements based on the evidence of the state of the room.