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.

Nina brushed her beautiful brown hair. She took great pride in maintaining it. She looked at herself in the mirror as she combed. Nina noticed some strands had been caught and pulled out. She forced herself to be more gentle.
Why did Nina brush her beautiful brown hair?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
she took pride in it.