keep (one's) composure

Translations
сохранять самообладание
Despite the chaos around her, she managed to keep her composure.
Несмотря на хаос вокруг, она сумела сохранить самообладание.
Definitions
To remain calm and in control of one's emotions, especially in a stressful or challenging situation.
Words
composure

noun
спокойствие
keep

verb
держать