I think it's a good chance she's a Sultan mix. Silkie is still possible though, with a pea comb. I just think Sultan is more likely. If she'd had a v comb you'd know for certain. Not all Silkies are super small, and Sultans lay smaller eggs than most chickens. She probably got the size from the...
Since she has five toes, a mini crest (I think), feathered legs, but lays blue eggs, has fluffy cheeks, and slate(?) shanks, I'd guess she's a Sultan(or Silkie)/Ameraucana (or EE) mix. I can't tell the comb type from the picture...that'd help narrow it down.