I am pretty particular about my work area, and if someone came and re-organized my desk and moved all the stuff I had on it, I would be pretty torqued, too.
I also cannot concentrate when my desk is a disaster. I have to put all the other work I am doing in a folder and set it aside in order to really think about what I am working on at the time. There are exceptions when I am incredibly busy, but once things slow down again, I make sure everything is put away.
Maybe instead of moving things off of her work-station, you could have told her about the manager's decision, and let her do it herself. I am guessing it was not "just the ribbons," in this case and more that you invaded her space but taking stuff off her desk.
Yes, she over-reacted and got emotional, but instead of saying "it's just ribbon" you could have explained the policy, apologized for moving her stuff around, and it might not have gotten so out of hand.
Denae