The Day My Siter Disappeared

Scarlette is a 16 year old girl with nothing but a fat ass. Her sister disapeared at a young age. For a 7 years she had to reflect that it was her fault her sister is gone maybe even dead. She can never erase the image of her screaming and crying for help out of her head. One day she finds her dad's rusty old time machine. She finds out it works and uses it to go back in time to save her sister. But she faces challenges in the past like seeing herself as a little girl and possibly getting trapped in the past. Will she resume her normal life or will she have to learn to live in the past?