I know that for myself personally (as a person who was disorganized as possible in middle school) what has helped me as an adult (and what I wish someone had taught me when I was younger) is habits. I have made a habit of checking off lists at certain times of day that have a max of 3 things on them. In fact, they always have 3 things so that I know if one thing is missing. For instance, before I leave the house I stop and say cell phone, purse, keys. Every time. Even if I'm just taking a walk or sitting in the yard. I may not always take them, but it's the habit that is important. I often start a habit with the three things written down and then post it where I can't miss it. And by that I mean suspending it at head level in the doorway I will need to walk through. As an adult I feel pretty organized and I'm generally the person who does not forget things and who has the things that I need with me.
I recommend that your DD should come up with a quick check to do at certain critical points in the day, especially at dismissal, and that you work to get an adult at the school to remind her to do it each day with fading prompts until it becomes automatic. And even then having that adult keep an eye on her for a bit to make sure it's still getting done. I used to carry everything with me in school and other than a lot of back pain it never did me much good. I still didn't ever seem to know the assignment and important items were constantly lost in my giant bag of everything. I was diagnosed with ADD in the early 80's in 2nd grade and back when I was in school there were no accommodations. As an adult I feel that I still have a lot more trouble than others do with remembering things, but I have developed my own ways of making it through the day so that I don't think anyone would realize that I was ever diagnosed ADD.
Also, in general, everything in my life has a place and I always put it there. Right away. Because I know otherwise my life will descend into chaos. It takes self control and discipline to always do everything right away, but between procrastination and the fact that going back to finish anything feels so tedious I'd almost rather suffer severe punishment than return to it later I know that I need to put my things where they belong the first time and never later. You need to help you daughter develop that voice that says, "No, you will do that now" that will play inside her head anytime she thinks later for any reason. Sure it would be more convenient to put away the paper I was just handed when I get to my next class because the kids who have this class next are already coming in, but because I know myself I know that I need to do it now or it will never get done.
Because of all of the methods I have developed I live a very organized life. My drawers are neatly organized and my storage is neatly organized and labeled. Everything has a place and is always put away. Things look neat and there is no clutter. I feel like people with ADD either master this skill or end up with a very cluttered and chaotic home and life. I can't function at all in chaos so I need to work at all times to keep it under control. I am working hard to teach DS (much more severe combined type ADHD) the same skills and help him understand that sometimes a big part of having a disability is having to work harder than others to achieve the same results, but that it is worth it in the end.
OK, that was long, but just wanted to put out there that your DD can learn to stop and check throughout the day and follow a system to stay more organized with the help of adults in the beginning and eventually on her own. If there is one thing I have found ADHD doesn't seem to interfere with, it's our basic innate habit forming tendencies and I use that to my advantage daily.
