So basically I slept over a friends house for a day and while i was there my sister used my 2008 Mac mini without my permission. She said her mouse wasn't working so she used my computer but she first tried to set up her mouse on my computer. I asked her what sites she went on (she is a frequent liar) and she told me ourworld.com which is a stupid avatar online game. I'm not sure if she went on any other sites or downloaded anything or any crap like that because she is a liar. Well as soon as I went on my computer it was SLOW as sin. I could barely load anything and there was a minor smell from the mac. My storage also went from 57 gb to 52 gb in 1 day and then 5 minutes later it hit 50?? I'm really upset and worried. What could she have possibly down. I just restarted my computer now but I'm not touching it.