Real Empress from a Noble Family

The poor Commandery Princess is down and out. Her father dies when she is young, and her mother passes away not long ago. Her grandfather, the only one she can rely on, is now at death’s door from his illness. Faced with the merciless uncle, the greedy aunts, as well as cousins competing to present the model of the worst relatives, the Commandery Princess could do nothing but feel depressed in heart.
But now, she comes and transmigrates into the body of the poor Princess!
As an expert who lived at the end of the world, regarding the killing as a common practice and being good at all kinds of intrigues and tricks, she is proficient in everything except drinking.
What will happen to her? What will she do to deal with these relatives? How does she become a famous empress of an eminent family from the poor Commandery Princess?