My DS12 had an extreme issue with organization. This all changed in 5th when his teacher chose a "no desk" policy - they just had tables. All of the kids information was kept in their backpacks. The only time it came out of the backpacks was to turn it in or to work on it at home. This solved the problem of stuff being left at school, not being able to find it, etc. When he moved to middle school, there are no lockers so the backpack routine just carried over. Could she be encouraged to keep all her work in a backpack? You could still have a folder you design, maybe even more than one for different subjects but discourage the use of the school desk/lockers for leaving papers in.
