Purza,
Well, when I was like 14, my room wasn't very organized.. My mom could get on me as much as she wanted but if my room did get clean it ended up back the way it was in no time..its just a basic teenager thing I guess... That was 4 years ago now, and at the moment I am taking a break from cleaning my room, so I guess organizational skills do get better I wouldn't stop telling her to clean her room, though. I wish my mom would have been a little harder on me about some stuff. She might be absolutely livid with you at the time, but when she gets older shell be glad you made her do her chores, ect.
It'll get better.
~Sarah