Or Delores *is* the Maze?
As I was thinking in an earlier posting, the reveries may be the very thing that is happening to cause the overriding. Remember that after the MIB aftermath with Mauve, Ford - on the tablet- dragged a "reverie" down from the top to the bottom of the screen (55:16-55:20).
His act of playing the reverie is likely the fact that the audio thread in her mind becomes absorbed with the audio (the soothing music) and shuts down the other "monkey brain" thoughts. But, even when the audio is dominating her internal narrative, she is still able to speak the thread that comes from her "heart".
Quite amazing when you map this to our own brain and our own understanding of how we think and react.