Had Annie LIKED the ending of Misery's Child...
Would she have taken Paul to a hospital?
The majority of the film after the discovery of Misery's death shows Annie as overly crazy over the death of a fictional character. She then becomes fixated on Paul "making things right" by writing that new book that would have brought her back to life. She clearly dosen't want the outside world to know that she's been keeping the world famous author in her house and goes as far to not have a phone so that outside contact would be rare.
Now lets say that Annie had a different reaction to the ending of Misery's Child. Rather then going nuts over the death, she took it as a good story. Do you think she would have eventually let Paul go? She might have been unstable, but she still trying to keep him alive. If not for the book, then what else?
Do you think she would have let Paul out if the ending was fine for her?