This is a link to feathersite. Scroll down until you see Silverduckwing. Or type silver duckwing old english bantam into your search bar, you will find that she is almost "spot-on" for that. She is too small to be american game.
I agree that she is a Silver Duckwing,...but not an OEGB. I would say she is a Pheonix Bantam. Especially if her tail continues to grow. If not then I would say she is a mix of some sort with Silver Duckwing coloring. I dont know of any pure bred game birds that have willow colored legs.