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By straight, do you mean smooth feathered? I'm not sure about frizzled genetics, but the silkie gene is recessive to smooth feather gene, so the offspring have to inherit one silkied gene from each parent to have silkied feathers. If your smooth hen came from 2 silkied parents, those parents only have silkied genes to pass on, so their offspring are 100% silkied. A smooth bird can have either 2 smooth genes or 1 smooth/1 silkied gene. Barring some odd reverse mutation, your smooth hen could not have come from 2 silkied birds, and given the result of 11/11 smooth offspring (assuming she was bred to a silkied cock), the odds are she is not a split either, but carries 2 smooth genes. Maybe an enterprising smooth smooth hen laid an egg in your silkied nest?
We have all smooth birds, and hatched 9 chicks this spring. 2 came out silkied! so we know that the cock is split for silkied, but we don't know which of the 5 hens are split. Guess we'll have to hatch some more to find out!