The person that originally asked the original poster to donate a quilt - may not have any idea of the actual cost and time involved in making one. I don't remember what size was requested - maybe it wasn't stated -
The person could say something like - it will cost me $ in dollars and so much in time - I can willingly donate $ for a sure thing for your fund-raiser - or I can make the quilt - which may or may not bring that much in at the event.
But the bottom line for everyone is - do what you want to do - or feel guilted/quilted into doing.