Danae's self control has been tested by the ordeal.  Thinking about her character and her background, it became obvious that what she fears most is the loss of control.  She was attracted to a military life because she likes things to run her way, and at her command.  When they do not, she seethes with a kind of existential resentment.  The whole thing about her housemaid being a witch may well have been a subliminal fear of not controlling every aspect of 'her' household.  Yes, she's a pretty toxic person to marry (her wife has my sympathies), but then again half of the Bronte/Austen novels are full of unsuitable suitors like her.