As for the details, it should be like this. When you heard about her death, you were a little sorry. You didn't talk to others well in high school, or she didn't talk to you much at that time. You are very angry. But today, she's gone, and your subconscious is thinking about this regret that you can't make up for in your life. So, your dream has helped you realize your wish: she has been chasing you endlessly and talking nonstop (but you know, in reality, this can't be done).
Well, the moral of this dream is: cherish the person in front of you, and don't wait until you lose it to regret it.