Very intriguing.(sp?) I've seen mystery quilts in monthly installments in Quilter's Newsletter Mag. but not heard of a mystery project before.
Did you have to buy the fabric at the store where she works? Does she want to display them in the store when you are finished?
Was this a challenge for both of you to gain confidence in selecting fabrics on your own?
Post pictures; fabric selection and then project when finished. Very interesting indeed.