If he had punched her in the stomach with all his strength, she would have felt it less than she feels those words. Even knowing that they are born of anger and irrationality, Cass's voice slams into her like a speeding train. Tainted, she could accept as mere histrionics. Marriage too good for her, she would gladly accept on the basis that she grew up in a world where all marriages ended badly, where so many of her friends and road-family had been driven to their nomadic lifestyles by failed marriages -- either their own or their parents'. But she has spent her whole life being homeless. She came here looking for her home, for her family, and has spent her whole time here either seeking them or trying to work so she could earn her right to belong with them and provide for them. To have that absence rubbed in her face like that is something she can't stand up to.
Without another word, without even an attempt at posturing for the sake of appearances, she turns and all but runs through the door and out of the house.
She gets almost two blocks towards her shop before she has to stop to throw up into some unfortunate person's boxwoods. Marnie is nearby, though, and is at her daughter's side swiftly to help her back to the Sign of the Weasel -- fortunate indeed, since without that support, Sable would have been physically unable to make it any further.