Had to look up that term
Wiki said:
Adjustment disorder is a maladaptive response to a psychosocial stressor that occurs when an individual has significant difficulty adjusting to or coping with a stressful psychosocial event. The maladaptive response usually involves otherwise normal emotional and behavioral reactions that manifest more intensely than usual (taking into account contextual and cultural factors), causing marked distress, preoccupation with the stressor and its consequences, and functional impairment
Best wishes to Kyoko san to get her groove back.