。
She attempted suicide.
Literal
She [topic-は] suicide-attempt [object-を] did.
未遂 (みすい, 'unsuccessful, attempted') is a Sino-Japanese suffix meaning 'attempted but not completed' — used productively for legally or medically significant attempts: 自殺未遂 ('attempted suicide'), 殺人未遂 ('attempted murder'), 強盗未遂 ('attempted robbery'). The 未 prefix carries a 'not yet' meaning (cf. 未来 'future,' 未完 'unfinished') and 遂 means 'accomplish, carry out.' The construction 自殺未遂をする takes the noun 自殺未遂 and verbalizes it with をする — productive across many activity nouns.