。
She won the 100-meter race.
Literal
She [topic-は] that 100-meter race [at-で] won-championship.
競争 ('competition, race') is a Sino-Japanese compound that here shades toward 'race' specifically — for spelled-out racing events, 競走 with the same reading is sometimes preferred. メートル is the loanword from French 'mètre', via Dutch — Japan's measurement vocabulary borrowed extensively during the Meiji period as the country adopted Western standards. 100 here is rendered with half-width digits, common in modern Japanese where contemporary precision matters; older or more formal text would use 百メートル. 優勝 'taking first place' is the same verb of championship-winning that fits any clean victory.