Thanks for your advice. I have been wanting to do the same thing for my 13 yr. old daughter that Ocean Lover is doing for hers. Not to just clean out (but lord knows it needs it) but just to give her a wonderful surprise. I mean do the whole "while she was out" thing - add a little less girly and a little more sophistication, but I have been thinking the same as you. Do I really have the right to throw things out without her permission or choose her colors, furnishings and fabrics without her input. She actually has very good taste (sometimes too good for my budget). After all, she is going to be living in it.
No offense Ocean Lover. For all we know, your daughter could have asked you to do this.
But....Beach Lover you have helped me make my decision. She and I will do it together.