Horror Idea For My Final Project

For my idea of the final project, i was thinking of making a thriller/horror as my genre. A young adult(teenager) sits alone at the park bench. the atmosphere is nearly dark with a cold weather. she gets flashbacks of her life and how she's been living. the flashbacks shows that she's clearly a disturbed character thus her flashbacks shows how she was kidnapped as a child and was found in an abandoned barn violated and near death. she uses that as an excuse to turn into a bad character. it made her grow up to become an evil scheming teenager. she tricks other girls to become her friend and leads them into bad life of drugs and sex. she's not satisfied until they all become miserable like her. As for the men, she uses them for sex and their money. she has been with so many boys trying to take their money and break their hearts that she didn't realise earlier enough to take a good look at her unimaginably miserable life. she realises it when sitting at the bench after losing everyone and everything thinking there was someone who was going to rescue her. as she's sat on the bench, she realises too late that there is a big storm approaching and she has to find somewhere to escape buy she has nothing and knows no-one. who would save her?