It is important that children understand that school is a daily responsibility and a job. As such, sometimes it is going to be fun but most of the time is going to be work. Children need to understand that homework is practicing what the teacher teaches so that it is well-learned and understood by the student. Also, it is important that children understand that doing good homework, leads to doing well in school, which leads to going to good colleges or getting good-paying jobs. Most children will improve if (a) the parent provides a quiet, clean, place to do daily homework, (b) the parent helps with the homework, checks the homework, or discusses the homework with the student, (c) the parent sets expectations that the homework is important and will get done on a timely basis, and (4) the parent provides lots of positive feedback and daily support on home-work well done or just for the great effort. It is most important for parents to set routines and expectations and enforce and support these. As the student improves, provide rewards or incentives. But be careful not to 'pay the child' for doing homework. The incentives should be varied and not given routinely. For example, maybe one day a week, your child can invite one of her friends to do homework together. If all homework is done on time, correctly, and neatly for a week, a reward could be given at the end of the week.
It is also important to check that the homework is not overwhelming your child because it is either too much or too difficult. Sometimes when this happens, students do not want adults to know and so they hide their needs by not even attempting to do the homework and just pretending that they are not interested.
-if she's not getting it done because she's disorganized, get her a planner that she can write down all her assignments in.
-Try sitting down with her and help her prioritize her time at home, i.e. if your homework isn't done, you can't watch tv. or if you have a lot of homework, do a little at a time, or do the hardest thing first to get it out of the way.
-help her set up a "homework zone" in which there are no disturbances, and she has everything she needs for homework in (a ruler, calculater, etc.) and if she needs help with something, try telling her to skip what she can't figure out by herself, and do everything else. once she's done, have her ask for help.
The question would be...why is she not finishing it? You are the parent, it is your responsibility to make sure the work gets completed. Take away the tv, music, or free time until its done. A child needs to understand that in life there is time to have fun but there is also times where you have to work to futher yourself in life. Maybe she needs help or maybe she just needs you there to make it fun....