Spank her.
Seriously, you need to make a deal with the landlord. If he's presented with a choice of losing money or working out a solution, he'll work it out.
If he's unwilling to work it out, stop paying rent. He can take your deposit instead, and you'll end up none the worse for wear, you'll just end up finding another place that you can share 3 ways instead of 4.
Trying to get the 6 year old chick to play by the rules isn't really an option - first of all it's unlikely as hell, and secondly it's not your responsibility unless you're in love with her, having sex with her, or related to her.
Seriously, you need to make a deal with the landlord. If he's presented with a choice of losing money or working out a solution, he'll work it out.
If he's unwilling to work it out, stop paying rent. He can take your deposit instead, and you'll end up none the worse for wear, you'll just end up finding another place that you can share 3 ways instead of 4.
Trying to get the 6 year old chick to play by the rules isn't really an option - first of all it's unlikely as hell, and secondly it's not your responsibility unless you're in love with her, having sex with her, or related to her.