When does John destroy his wife's dairy?

Throughout the short story, the narrator portrays her husband as rather callous and insensitive to her serious mental condition, and he continually makes decisions that exacerbate her mental illness. One such decision her husband makes is that she is not allowed to write in her diary. John believes that it is imperative that his wife do nothing at all in order to get as much rest as she can. However, John fails to see that socializing, exercise, and mental stimulation is needed to cure his wife's severe depression and impending psychosis. The narrator continues to write throughout the majority of the short story but is continually interrupted by her husband and his sister's presence. The narrator also mentions that she feels too exhausted at times to write in her diary. Overall, the narrator never explicitly states when or if her husband takes her diary. As far as the reader knows, the narrator always possesses the diary and simply hides it from her husband. As the narrator's mental illness worsens, she completely stops writing on her own and becomes infatuated with the figures inside the wallpaper.