I had a roommate like this. I did everything myself for a while, then talked to her about it multiple times and then, after resorting to nagging, I moved out. Sometimes people just don't do what they say they will.
If I had to do it over with my new roomie, I'd start out talking to her, just in case she doesn't realize what a sloppy job she's done.

Get a new one when the lease is up. Its not worth the constant headache Or live alone, even better!

I have two roommates that I've tried asking to share in household duties. They've ended up just taking care of their own stuff but not cleaning common areas. I have no idea what to do! One of them, I'm renting from and the other I hardly see. It's ridiculous. I've ended up just cleaning from time to time and staying in my room the rest of the time.

This is why I live alone...If I want my house clean then it's all on me. I think I would try approaching them or maybe joke around about it to lighten it up and see if they pick up the hint, but it seems with most of these situations talking doesn't solve the problem. Moving out does...

I had a roommate who was like this. We had a schedule to divide the chores. The other roomie and I kept up our chores, but this lazy one didn't. She was so darn lazy that she was disgusting at times. For instance, the kitchen garbage was full, so she took out the old bag and put in a new one. And left the old bag full of garbage right against the sink for several days! How disgusting is that?

Now that I can afford to, it's sooo worth not having roommates!

You don't have to stop being friends but I think it's time for her to go.

see that's the challenge - you probably discussed what each person would do but not what quality you were hoping for each time. i think that you have to realize that not everyone has the same standards of cleanliness or what have you and that if you want things to be done a certain way then you need to be specific about it. i think that there's a very big chance that your roommate will become defensive if you bring it up to her, so you need to be careful with how you start the conversation. make sure that you start off in a positive light and say that you really appreciate that she's making the effort to keep with the chore schedule and what have you, but that maybe there's a way that you can suggest things get done so they are up to par in your eyes.

I nag until it's impossible for them to ignore me.