calm and collected

Translations
спокойный и собранный
She remained calm and collected during the crisis.
Она оставалась спокойной и собранной во время кризиса.
Definitions
A state of being composed, self-controlled, and not easily agitated or disturbed, especially in stressful or challenging situations.
Words
calm

adjective
спокойный
and

conjunction
и
collected

adjective
собранный