The poncho is VERY cute and so is your daugher.
I am having the same issue with sizing for my daughter. She has picked out a poncho that is for an adult. I have no idea how to scale this down to a size 12 or 14 child. You completely lost me in your directions as to how you did it. The poncho I am going to do is a rectangle where an adult small would be 18 1/2" wide X 49" Long . A medium would be 52" long and a large would be 55" long. Do you have any idea how to scale this down? Thanks so much for any help you can give!!!!