The mysterious "kill- her"

It was time for school, "Ringgggg" went Sarah's alarm. She was too lazy to get up, so she stayed in bed for a while till she got up.
Sarah got out of bed and she jumped into the shower when she heard noises coming from the basement. She got out of the shower and decided to go check what it was.
She went to her bedroom and dressed up fast as she could.

"Hello?,is anybody there?" She shouted. She got no response in return, so she went back to her bedroom and grabbed her school bag.
She went to the kitchen to grab her lunch and with that she locked the door and drove to school.

When she got to school she parked her car in the student parking lot and walked to class.
She got to class and greeted the teacher with a smile on her face "Good morning ma'am" she said politely,"Morning Sarah" the teacher answered.
She sat down at her seat. "Sarah, psst!" Shouted a gentle voice from behind her, she turned around to find one of her friends, "Amy, Hi" answers Sarah calmly.
Sarah and Amy chatted for a while when they heard the teacher say " Time for attendance class!, please settle down!"
The teacher was done taking attendance and there wasn't anything to do, so Sarah and Amy decided to take a walk.
"Sarah you've really changed, are you doing good?" asked Amy with a concerned look written on her face, "Yeah, why?" Answered Sarah with a confused look on her face.
"Nevermind," as Amy was about to continue the bell rang.

They walled through the hallways and got to their respective classes.
Soon school was over so she decided to eat out, "Hmm... where can I eat today?.." she wondered. She decided to eat at KFC so she called her neighbor who was her her best friend as well. " Heyy!, Jess wanna go out to KFC to eat?" Sarah asked Jess excitedly. " Yesss of course!" Answered Jess.

Sarah heard the noise coming from the basement. " Not again ugh." Sarah said with annoyance in her voice, she walked to the basement and switched on the lights. " Shut up You idiot!" She shouted and she slapped the woman that was seated in a chair, all tied up.

She didn't listen, so Sarah took a wooden stick and broke it on the woman's head.

"Hello Sarah!, are you home?!" She heard Jess say. " Yeah I'm coming!" Sarah shouted loud enough for Jess to hear.

It was now time to leave, so Sarah switched off the lights and locked up. ". Come on." Said Jess. They walked to the car as Jess said " You're being weird, Are you ok?", but she got no response. She ignored it and continued looking at the road.

They stopped at the KFC drive thru when Jess saw the blood on Sarah's arm, " Sarah, why's there blood on your arm?.." she asked as she patiently waited for an answer.
" Don't ask unless you want to die too." Sarah answered with anger written all over her face.

After getting their food, Sarah drove home with Jess.
" Sarah please explain what happened earlier on.."  Jess said with fear.

"SHUT UP!" Shouted Sarah still angry.
Jess got scared and ran out of the house, the next day everyone at school was afraid of Sarah but the teachers.
"Sarah calm down please." Said a teacher walking past Sarah, She then pulled the teachers collar and dragged him out to her car, then forced him to get in her car.
She drove home with the teacher afraid, she got home and pulled him out.

You either die or shut up!, choose!" She shouted at him even though she was afraid she didn't give in.
"I- I'll shut up.. S-Sarah don't do this, P-Please.." he said with tears streaming down his face.
She then killed him with an axe slicing through his throat in front of the woman, which turned out to be her accomplice.
Right after, they left. For good.