Stupidity: When Laura goes back to the house to get her bag, she takes off her wedding ring and flushes it. Problem is, she knows how her husband is and doesn't take the time to make sure the ring goes down! But she makes sure there's no other trace of her being there (flushing her hair down the toilet and drying the floor off from her wet feet!).
Stupidity: When Laura visits her mother in disguise, she tells her about meeting a nicer man after leaving Martin. It's one thing to tell her mother that he teaches Drama, but it beggars belief when she tells her the precise location of where he teaches! You would think that being her first time seeing her mother in a long time while disguised as a man, she would keep this information to herself until she was comfortable. Of course, Martin immediately manages to extract this information from Chloe.
Stupidity: At the end of the movie when Laura discovers that all the cans are neat in her cabinet, she knows she has to leave the house. There's a back door to her house, but she runs up the hallway to the front of the house. She could've been out of the house in seconds going out of the back door, but of course that would've ruined the end of the movie.
Chosen answer: No, the doctor was not in on her plan. She had her escape planned for a long time, but was waiting for the right time. The stormy weather on the boat provided the "perfect" time for her to put her plan into action.
Ral0618