The girl framed the murderer, placed evidence to clear the others to do so. That's why she was there, that's why she gave him the map, and she got away with it too =/
"Guess what? You're still a monkey! It's okay though, THERE IS MORE QUESTIONS???" Are you serious??? There "IS" more questions!?!?! I believe YOU are the monkey, good sir!
You're taking things a little too seriously...