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I see what you mean on the Welsummer, but the second hen isn't a Hamburg. Hamburgs have a rose comb, she's almost solid white and in Hamburgs i have ever only seen hens get darker (though i guess more white is possible). Another thing would be lack of white earlobes, and slate legs. If she were a cross, she would be at least a second generation cross as rose comb is dominant over single comb. So you would have to breed the half single/half rose comb chick back to a single combed breed (but looks like she's pea the more i look actually? If so then a rose comb/Pea comb should come out walnut from what i've heard, though again second generation cross would fix that).
She has yellow legs with, what looks to be a green tint. Yellow legs are about the most recessive leg coloration i have seen, the green tint would indicate the dark fowl (which is why she is mottled instead of spangled) in her ancestry. And besides all of the genetic stuff, she just has the game "look" which i know being around them all my life, if she has Hamburg i would say she is a HamburgXGame.
-Daniel.