I dreamed last night that I crushed the snake to death.

First of all, I want to say a few points, 1. Personally, I prefer Freud's dream analysis. Your description is not particularly careful. The following analysis comes from my speculation. There must be many shortcomings in the comments. Please forgive me.

Let's look at your dream. You said your aunt was entangled in a snake at the school gate. According to Freud's theory, the snake in the dream is a symbol of male sexual organs. You said that your aunt is a female image. It can be inferred that a woman around you, or a woman you have heard of or read about, has been sexually assaulted or entangled in sex. In your dream, you instinctively saved your aunt and the snake was crushed to death. This may reflect that you hold the male genitalia yourself. The above analysis is my humble opinion! I hope it helps you. Finally, a word for you: believe in science and oppose superstition.