Wholesale prices are generally 50% of retail prices so if they'll be sold at, say, $40 in the store, you'd get $20. Will that cover your time and costs? Probably not, but you'll walk away with immediate cash whether she sells them or not.
Commission would (usually) give you a higher percentage on each quilt sold, but you'd only get paid for the ones she sells. You do, however, retain full ownership of those that don't sell.