Yeah, that body is looking girly to me too, so I think you have an older hen. It is not uncommon for a girl to have a spur, and you got one, she's just not 6 months old.
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Looks like a spur to me... I think I can see the 5th toe just below it.
By the size of that spur... I'm gong to say that it is likly not a hen... and if it was, this bird is probably at least a year old if not two or three. My two year old roos don't have spurs that big. But spurs...