My mother died, but I dreamed that I was buried with her and she was still alive.

This shows that in your shallow consciousness, although you know that she is dead, you still hope that she is alive. Dreams can't be said to be some kind of symbol, but they are only the truest yearning in your heart. People live in this way, and they have to go through birth, illness and death, but they also give us some good memories, because only with these memories can we deeply feel some good things in the past and have the courage to go on. It is also because of regret that I understand how to make up for it in my later life. I hope you are sorry for your loss.