A Slytherin or Black

She had immense power that the Dark lord could only dream about. A dead mother and missing father. She was adopted by a noble pureblood couple who cared only about their son. She is taught to live like a lady, to stay at home, get married to a pureblood man and produce their hier. She always lived opposite to their expectations. She finally goes to Hogwarts School of Witchcraft and Wizardry for her third year. She meets her childhood friend here and her long lost family. She struggles to keep up her mental health from all the abuse, she finds a friend or family who helps her.
This is the story of Carina Narcissa Slytherin. She is a direct descendant of Salazar Slytherin. Though that is not her true identity. She has a father, twin brother and a sister who are unaware of her existence. Will she ever be able to meet them? Will she survive while the Dark Lord thrives for her power?
This is my first Harry Potter fanfiction. I hope you forgive me for all the grammatical errors and other mistakes.
ENJOY THE BOOK!