In this task you are given a short story and a question regarding that story. You must answer the question based on the events of the story. Try to use the same words in the story to answer each question. You should completely answer the question in a short answer. Do not include information that is unnecessary to answer the question.

Cathy was in a rush to get to school. She had to do her makeup much faster than usual. All day, girls gave her some weird looks. Finally, at the end of the day she looked in the mirror. She realized that she had left a big streak in her foundation.
Why did She realize that she had left a big streak in her foundation?
she looked in the mirror.