Okay, yeah, I could see that as making her shutdown almost completely (doormat-like) because she is Done with All the Things or making her a hard-hearted person seeking revenge on her husband and anyone that she saw as having hurt her and Draco. Definitely no loyalty to Voldemort (maybe even passively working against him?) But I totally could see her as being done with Lucius loyalty-wise -- you betrayed me and my child for a losing cause -- and trust-wise -- how could you trust a person who willingly sacrificed your child to a monster?