That was actually terrifying, so scary it compelled me to log in and write about how bad it was. I can't recall ever being scared that bad from my computer.
I already had my volume fairly loud so the music alone almost scared me to death and put me on edge. Only being able to see things while moving your mouse was the icing on the cake, making me spaz out and rapidly check everywhere with my mouse.
She got me after I went through a door while I was already freaked out due to the room I was coming from explaining how to sprint. When she jump scared me it was so intense and loud I literally violently pushed both my keyboard and mouse away while throwing off my headphones within a second. Nothing has ever made me react that way.
I don't know how you managed to do it but this may have been one of the scariest times in my life.