HP in the name of Slytherin

Introduction: Catherine Slytherin can't remember the past. She wakes up in 1966 in a 6-year-old body, and a thousand years have passed. She was trapped in a set castle, except for a basilisk that could never have enough to eat, a silent house elf, and only the remnants of Salazar Slytherin in her mind. When she came to this world in 1971, she didn’t know everyone, but many people knew her. In the history books she is a missing time traveler. Headmaster Dumbledore, the ghost of Hogwarts, they say she was the founder's chosen heir to Hogwarts. Voldemort, whom she thought was her opponent, hesitated to speak to her, and said an incomprehensible "We are