Daily Chinese Idiom Guessing Game
Consistent from beginning to end; unchanging; constant.
始开始；终结束。自始自终一个样子。指能坚持，不间断。
《荀子·议兵》虑必先事而申之以敬，慎终如始，终始如一，夫是之谓大吉。”
She has been始终如一 in her dedication to the project.