She's that partridge-ish/gold duck-wing-ish/not really any color a lot of easter egger hens are.
It's a pullet.
I can't help with size, no reference. If she's small, she may be a bantam. Or may just be a runt. Bantams are only about 1/5 the size of a large chicken. Some easter eggers are pretty light bodied.
I'm not great with age, but I'd agree she could be around 2 months old.