Scariest dream ever (what does it mean)?

I ha a terrible dream about me getting lots of phone calls when I was home alone. It was about where I was in the house and where my music (probably my favorite thing in the world) was. I eventually spoke up and said the basement which then someone came down, I ran around and grabbed a chair to fend off myself but I couldn't attack. I didnt know who she was but all she wanted was 'revenge'. She attacked me with a pole and asked for my chair to stopp attacking, I gave it to her and she attacked me with it. She kept asking for things but I gave up and was killed. I found out who she was then. I had a sister who was playing in a section of the attic one day, the attic was 2 separate sections, so they moved back an forth but no one knew this. She walked in one part, it spun around, and I didn't say anything and she died. Hence the revengeful painful death distowed on me. Could this mean anything?