The 20-year-old hopeful beat the boys, who received the lowest amount of public votes and were sent home.
READ: WHY ARE WE BULLYING X FACTOR'S CHLOE JASMINE FOR BEING 'POSH'?
But instead of being able to celebrate making it to week two, Stephanie had to beg disgusting online trolls to stop telling her to die.
Overload Generation received consistently bad comments from the judges, in particular Simon, for both of their performances at the weekend.
Thanking those who had voted for her, Stephanie last night tweeted: "YOU made this happen for me. Honestly. no words. I love you."
READ: WHY IS BULLYING SOMEONE FOR BEING BEAUTIFUL SEEN AS ACCEPTABLE?
But her happiness was short-lived, as she quickly followed up with: "I Hated being in the sing off with overload. They are the loveliest boys and got on with them so well. Please stop telling me to die :("
Fellow X Factor contestant Chloe-Jasmine Whichello took to Twitter to defend Stephanie, writing: "Wonderful girl, I'm just thrilled for you. Talented, beautiful and brimming with kindness xxx"
READ: DOES MORE NEED TO BE DONE ABOUT CYBERBULLYING
Last night Stephanie's mentor Cheryl Fernandez-Versini said the sing-off had been a wake up call.
She told Xtra Factor's Sarah-Jane Crawford: "We need to do a lot of work on her, on her self-belief. She's got a delicate voice… It's a good wake-up call for her and for me."