。
She took her own life.
Literal
She [topic-は] her-own [possessive-の] life [object-を] cut-off.
自らの命を絶つ is the formal, dignified way to refer to suicide — as opposed to the clinical 自殺する. 自ら (みずから, 'oneself, personally, by one's own hand') is a literary reflexive especially common in formal writing, news, and elevated narrative. 命を絶つ — literally 'sever one's life' — is a set euphemistic phrase for taking one's own life. This phrasing is what you'd expect in obituaries, news reports about public figures, or literary prose; the gravity of the words matches the gravity of the act.