The case of Louise presented in your text is a classic example of persistent depressive disorder in that she was unable to derive pleasure from normal life events such as the marriage of her daughter. Your authors describe her as

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The text describes Louise's persistent depressive disorder as causing her to live under a gray cloud, where she is unable to find pleasure in normal life events. This indicates a persistent feeling of sadness and low mood. The other options, being withdrawn to the point of isolation or living a binge-filled life, do not necessarily reflect the key symptom of persistent depressive disorder.

The Case of Louise Presented in Your Text Is a Classic