turn (someone's) millstone

Translations
повернуть (чью-то) мельничный камень
She managed to turn her millstone and make the project successful.
Ей удалось повернуть свой мельничный камень и сделать проект успешным.
Definitions
To perform hard or burdensome work for someone else, often to their benefit and your own detriment; to labor on behalf of another, especially in a way that feels thankless or obligatory.