Lady to Queen

Her older sister, the queen, died in result of a meticulous trap and she herself was drowned alongside the rest of my family.
Patrizia, at the last moments of her life, fell into despair. 'If only I had been the Queen.' She had the confidence to not love the emperor. Then none of this would've happened. Everyone would've been alive, everyone would've been happy.
And when she opened her eyes again, she had returned to before her sister had become the Queen.
At this point she makes a huge decision to change the future of her family and herself.
"I shall become the Queen instead!"

Will this bring the happiness she sought for?
Or will this create for chaos?