noun

the state or feeling of being disturbed or agitated; agitation.

she laughed to mask her discomposure

agitation,discomfiture,discomfort,uneasiness,unease,confusion,disorientation,perturbation,distress,nervousness,flusteredness,anxiety,worry,consternation,disquiet,disquietude,embarrassment,abashment,chagrin,loss of face,discombobulation,disconcertment,disconcertion,inquietude