The best way I found for garage sales is to do it by weight. That way no one has to measure anything or have people mad because you shorted them or the fabric had a chunk out of it. One sale had $2 per pound. A yard is around 5 ounces so depending on quality and how fast she wants to sell it, you can go to $5 a pound for the good stuff. This is the same whether scraps, or bags of scraps, fat quarters or yardage. It helps the sale go fast. You need a scale or two, lots of bags and then weigh the bags and that is it.
Have big and clear signs all over or you will get a lot of questions. Have it on the sign how much a yard weighs so they can figure out if a good deal themselves. Have space where people can stack their stuff while going thru the fabric and have a lot of bags. Even grocery sacks are fine.
The best part of this is that scraps sell too. I love scraps and love filling bags. If you dont know if kits are complete or dont want to deal with kits she has set up and you dont want to go thru them, sell them by the pound also.
Then all you have to price is books, magazines, and notions/tools.