Just obtained this pullets and would like to get an amidea on background. She's from an environment with lots of backyard flocks (and in the street, also) so mixing is likely.
What you just mentioned, From a mixed backyard flock, only the Creator may have the answer.
I know you are wondering what she looks like.
All I can see,,, is a BEAUTIFUL CHICKEN.
Lets see what others see/think.