I would consider all of the circumstances. First, how much of a refund did you receive? Are you still satisfied with your per yard price for the fabric, including the shipping cost?
I would definitely let her know via the contact button and see if she replies.As a seller, I would not ship without confirmation that a lesser amount or different product is okay with the buyer.
If you don't want to leave negative feedback, you can rate her lower on the "star" portion if an area is applicable to your situation. You can also leave positive feedback and say "I like it, but...."
If you are satisfied with the product, I would probably accept it and move on. And, I would think twice before buying from that seller again.