duō​nián​xí​fù'áo​chéng​pó

to finally come into one's own after long years of suffering

多年媳妇熬成婆 多年媳婦熬成婆 duō​nián​xí​fù'áo​chéng​pó
to finally come into one's own after long years of suffering
literally "after many years a daughter-in-law finally becomes a mother-in-law"; used to describe someone who has finally attained a position of authority or success after a long, difficult period of subservience or hard work