jì / rán / yǐ / jīng / zuò / chū / chéng / nuò / tā / biàn / shì / bù / fǎn / huǐ / jué / dìng / chéng / dān / quán / bù / zé / rèn

既然已经作出承诺，她便誓不反悔，决定承担全部责任。

Having made a promise, she vowed not to go back on it and decided to take full responsibility.