Cousin wrote in diary that she wants to kill me?

My cousin, her mother and I had a little argument. Weeks have passed and I borrowed my laptop because of the school…

I searched Word there and there were already stored documents, so I opened a saved document and they said that's why they wanted to kill me (which is why we were arguing).

What should I do now please? The dispute has actually been resolved.

You say something like that quickly, just forget it and be glad that everything is clear

Maybe she just wrote it purely because she guessed you were snooping and trying to wipe that out for you. And even if it is true. It's one thing to write something down in anger, but to plan something completely different.