Because she has been abandoned by one, who himself has fallen in distress and who is foolish and deprived of all happiness. She, therefore, should not be angry.
विषमस्थेन मूढेन परिभ्रष्टसुखेन च। यत् सा तेन परित्यक्ता तत्र न क्रोधुमर्हति॥