[Trakadon]

I'd give her the ultimatum if I were you, if she isn't carrying her own weight in paying the bills. You don't need that kind of atmosphere every waking moment.

I'd start out by telling she needs to start doing her share or you'll have her kicked out. If its your tv take it away, if its your system take it away, if anything at all she uses is yours take it away. If you pay for the tv bill then cancel it. If you pay for the internet and you have a password protect on a wireless connection then request a change in the password from your provider and disconnect her from the internet. Even go as far as to only buy food for yourself. Force her mom to buy her food. Just do what ever you can to show her that she'd be helpless without you there.

I've done this a few times myself. Sometimes the person gets their act together and sometimes they just leave. Either way you pretty much win.