。
She remarried quickly.
Literal
She [topic-は] quickly remarried.
再婚 ('remarriage') is built from 再 ('again / re-') + 婚 ('marriage') — a Sino-Japanese compound. The same 再 prefix is productive: 再会 ('reunion'), 再開 ('resumption'), 再起 ('comeback'). Plain past 再婚した describes the completed event. Remarriage in Japan has historically carried more social weight than first marriage — particularly for women, where societal stigma was once heavy and where women must observe a 100-day waiting period after divorce before remarrying (a rule reduced from 6 months in 2016 reform).