Overall, you have a good story idea, but there are some grammar and punctuation errors that need to be fixed for clarity. Here is a revised version:

One night, 14-year-old Sophia had a strange dream. In the dream, she was walking down the street when someone grabbed her shoulder and pulled her towards them. Then, someone squeezed her hand tightly. "Listen, do not go to the party on September 15th. It would be dangerous," said an old lady in a deep voice. "How did you know?" asked Sophia. The old lady smiled, "I am a witch. I see things." Sophia suddenly woke up, feeling terrified. She screamed, and her mother rushed to her voice. "What happened?" her mother asked. Sophia told her mother about the dream, and her mother was surprised. "Let's stay home. This party doesn't mean anything," her mom suggested.

On September 15th, Sophia's family stayed at home, but the Wilson family, who had planned to attend the party, were involved in a big car accident. From then on, Sophia always believed in her dreams.