Originally Posted by hopetoquilt
Take the pattern out, show her the fabric requirements and go on-line to show her the cost of the fabric. Go on a site like thousands of bolts and put all the necessary fabric in the "cart" and show her the total with shipping and tax. Don't forget thread and batting. When she sees that it can cost alot just for the materials, maybe she will understand.
Tell her how much and what kind of fabric you will need and let her do the shopping for it. Charge her to sew it.