Austra white don't have grey feet.
She's a mix of some kind.
Bresse Gauloise have grey feet and a white body. But she's not one of those.
Easter Egger comes to mind, but no, I don't think she's EE either.
The only other thing that comes to mind is White Australorp. But they don't have black faces either. She's gotta be a mix.
I have one that looks exactly like that one!! I bought from TSC as a day old California Tan. It is a beautiful chicken that I thought was a rooster, but suspect a pullet. She/It is about 6 weeks old.