She looks like she has some Silkie ancestry way back, from the dark skin and walnut comb. Her feather pattern looks like a clean silver duckwing. I'd guess she's got OEGB, dutch bantam, or something similar in there based on the compact bodyshape and small size.
She looks similar to my golden Phoenix. My guess is she is a silver duckwing phoenix. They are smaller chickens. I think the females only get to be around 4 lbs.