Why does Rosaleen say may is a bona fide candidate for the nuthouse?

Rosaleen suggests that May is a bona fide candidate for the nuthouse due to her intense emotional struggles and her tendency to be overwhelmed by sorrow, particularly regarding the injustices of the world. May's deep sensitivity leads her to experience profound grief, which manifests in her behavior and isolation. Rosaleen recognizes that May's mental state is precarious, highlighting the impact of trauma and emotional pain on her well-being. Ultimately, this reflects the broader themes of mental health and the challenges faced by individuals coping with loss and sadness.