This is the hardest thing for everyone who handmakes items. Folks buying generally have no idea of cost. First thing would be to list out the actual costs of the items involved (not a sale price - actual items costs). Line item them - fusible, sashing and border fabric, batting, backing. If they are still interested, then you can discuss your fee. Being a dear friend, you will probably make this a much lower amount than for a 'regular' customer. But, do not be surprised if the balk at this amount. It is incredibly difficult to do this for friends, but, you must put it in writing and you must get a deposit for at least the materials cost. This saves so many problems down the road. Sorry for the loss of your friend.