What did she do from 3:30 to 9:30? Was she actually cleaning or was she hanging out reading/playing.
My daughter is 10. She can make her bed,pick up the floor, and put away the clothes on her own. However directions like "go clean your room" do not get me very far at all. Also, punishement doesn't work very well --- things take longer, unless there is a specific show she'll lose or a particular event she'll lose --- but even then the directions need to be clear.
What does work is, "Can you please go put your laundry away in the closets and drawers; and then pick up all your dirty landry and put in in the hamper. If you can get those two things done in the next 20 minutes, we'll get ice cream after lunch (or some other reward)" and then I set the kitchen timer for the 20 minutes. I could do all that in 5 minutes or less, but she needs longer, because my daughter is a straight A student but organizing stuff is really hard. My mother-in-law says my husband was the same way. If you told him to clean his room, he would dust and vaccuum ever inch very slowly -- he would spend an hour to on a two shelf book case. You could eat off the bookcase, but the rest of the room would be worse then when he started! I have a sister who was like that. Some people are just not good with "stuff."
When my Dad was dying last spring, I hired a professional organizer to come and help my daughter do her spring cleaning of her room. This mean going through all the drawers and closet to find all the clothes that don't fit, and reorganizing all the book cases. My daughter loves books. Since doing that she has been able to keep it neater because she really understands where the things should go. Part of the problem with cleaning up, if you have thing that have never really been given a "home" it can become overwhelming to make the decisions.
All of this was hard for me to understand because according to my Mom, she never had to tell me to clean my room. I just saw my older siblings do it, and I did it. Organizing stuff was easy for me, thus the cleaning was easy.
Consider talking to her about why this is so hard for her and takes so long? Tell her that you are frustrated and hurt (the hurt is a big deal at this age) that she doesn't seem able or willing to do this, and why is that? Then listen, she may have a reasonable problem that if you talk and listen, you may be able to solve.
If that doesn't work try rewards, specific directions (chunk the room down in to smaller tasks); and time limits for each task. This may work. It is worth a try.
If all that fails, you may have to reduce the stuff in her room, until you get it down to something she can manage.
Good luck!