The Empress’s Dagger by Amanda Roberts

As the Qing Empire continues to crumble, the Empress is more desperate than ever to find a way to secure her stranglehold on the country. Every day, she forces Jiayi to use her powers to see into the past to the time of Empress Wu to discover the secret to securing power.
But Jiayi already knows the answer.
Empress Wu’s dagger is more than it appears. Blessed with an ancient power, the dagger can be used to make and destroy empires.
Jiayi’s ability to travel through time is growing stronger, and she is not sure she wants to use that power to prop up a dying empress. There is only one man she wants to save. The man she lost her heart to. A man who died over a thousand years ago.
Zhihao knows he cannot fall in love with Jiayi, a palace slave. But with each passing day, his feelings grow stronger.
When a ghost from his past walks into his life, Zhihao may have to choose between his country and the woman he loves.