Harry Potter: Your Words Beneath the Willow

When Meng Hui wakes up, her whole world has turned upside down. She'd finally finished the mountain of homework assigned over the National Day holiday in her first year of high school, and hadn't even gotten to enjoy her break yet. How had she ended up in this bizarre place?! But what drove her even closer to despair was that she was now a Slytherin at Hogwarts, and her name had been changed to Bai Mei?! Seriously, if she had to transmigrate, couldn't she at least have avoided becoming a student?! Bai Mei was furious. Fine, she couldn't fight her classmates, so she'd go beat up some “troublemakers from outside school”... Wait, no, that's called persuading people with virtue! And so, a young girl wiped out the Ashwinder gang in the Forbidden Forest; on the very first day of the elf rebellion, the leader got his head blown off?! The Wizarding World began spreading stories about Miss Bai Mei. Some said she was The Chosen One, others that she was the Dark Lord. Bai Mei just shrugged: “Whatever~” The wizards who'd just been arguing over whether Miss Bai Mei was good or evil then looked at the newspaper: “What?! She developed a soul-healing potion?!” “Wait! She received the Order of Merlin, First Class?!” ... Bai Mei had barely had two good days at the height of her fame when she was sent to Hogwarts a hundred years into the future. Bai Mei: ... Seriously! Am I a football or something?!

The good news: A hundred years later, she's back in her homeland, with a loving family, and her name is back to what it was.

The bad news: There's a Dark Lord around at this time! Hmm... how come... he's kind of a pushover? Wait... why is this black-haired guy so handsome...

(Severus Snape is the love interest. The heroine was originally from the 21st century and transmigrated twice!!! Contains lots of original worldbuilding. The author doesn't like Lily. The story follows the original plot, but the heroine won't be a tool for the trio.)