Hektore: I found out from another employee who would not benefit from her getting in trouble.
Cimarron: You make very good points about the space not really being "mine". I never thought of that, at all. and I agree, she would have tried harder not to be seen if she was doing something wrong. I don't think there was anything confidential left out, I usually try to clean up before I go away. My desk was locked, I had forgotten that I did that, thanks for the reminder!
Lindy: I like the way you worded the question. I will remember that if I decide to ask her about it.
Jazz: I am not sure where the uneasy feeling comes from, I hope it is unwarranted. But I will definitely be more aware of what I leave around when I am not there. I did ask a friend to keep an eye out, and if she sees her going in my office, to try to see what she is doing.
For now, I am going to try to give her the benefit of the doubt because I have no proof that anything wrong was done. So, sorry to say Plan9, no paint can on my door. Not this time
I am, however, going to do a better job of cleaning my desk before my next week off so I know what I left behind and what is where.
Thanks for all of your input. You have all helped me see things about this that I would not have thought of.