She is a mixed breed and I don't see any signs of her having Cream Legbar on her genetics. They have yellow legs, crests, different body types, and lay blue eggs.
Sounds like from your user name you should know! That's why I said mixed. I'm aware of the crest, but I didn't know the blue egg part. So probably not. Wonder what she's mixed with? She is pretty!
I agree with Bridebelidver, she is very pretty! She has some pencilling on her chest, so she may have some Silver Pencilled Rock in her genetics, although they have yellow legs...