It turns out that it meant very literally when Oikura said her mother refused to eat. Her mother refused to eat until she starved herself to death. Because of Oikura's psychological problems she didn't realize that her mother has died. Oikura had been living and "taking care" of her mother's corpse for two years. She didn't notice the smell of a decaying body because it was covered by the smell of trash that had been piling up in the house. Oikura came home one day and couldn't find her mother not because her mother left home, but because in a period of two years, her mother's body rotted until it completely disintegrated. Despite learning this horrible truth, Araragi still decides to go and tell Oikura, much to Hanekawa and Ougi's surprise. After Araragi told Oikura about the truth, Oikura took it surprisingly well. Oikura seems to have suspected this possibility. In the end Oikura appears to forgive Araragi. However, Oikura tells him that she still can't come to school any more. The government can't provide her anymore support for her to live in the current home so she has to move again. The next day, Araragi finds out that Oikura apologized to Senjougahara in the end. He also finds a letter from Oikura under his desk. The content of the letter is not revealed to the reader, but it seems to be of a positive note.