There are many possible answers to this question. Here are some possible reasons: 1. She may not be interested in you or be afraid to establish a deep relationship with you. She might think you're not interested in her or she's not sure if you're interested in her. 2. She may have some awkward or uncomfortable situations, such as some sensitive topics appearing in the chat or she encountered some difficulties. These difficulties might make her nervous and evasive. 3. She may have some personal problems or worries that she doesn't want to share with you or express more discreetly. She might just be a shy or introverted person who is not good at communicating with others, so she might be more evasive. The above are just some possible reasons. The specific situation still needs to be judged according to the content and situation of your conversation.