Mrs Crouch and her husband were allowed to visit their son in Azkaban shortly before he died. She had to be half carried out of her son's cell after their visit. Mrs Crouch died soon after her son; according to Sirius, she wasted away through grief.
Mrs Crouch attended the trial of her son, Barty Crouch Junior. A frail, wispy little witch, she clutched a handkerchief to her mouth as her husband and the Council of Magical Law sentenced their son to Azkaban. She sobs as her son denies the charges; when her husband disowns their son in front of the whole crowd, she gives a great gasps and faints in her seat.
Barty Crouch Junior reveals that it was his mother who persuaded Mr Crouch to save him as a last favour to her, knowing she was dying. She and her husband visited the prison, and gave their son a draught of Polyjuice Potion containing Mrs Crouch's hair. She drank a draught of the potion that contained one of her son's hairs, thus taking on his appearance. Mrs Crouch died shortly after the deception, careful to drink Polyjuice Potion until the very end. She was buried under her son's name. Mr Crouch staged his wife's death after bringing their son home, but the grave bearing her name is empty.