Araucanas come rumples and rumped, the ones with rump are not showable, same with they can be without tufts as well, again just not showable. Its recommended to breed rumped birds with rumpless to keep the spines from turning to short and crippled(nerve damage) just as it is normal to have and breed non-tufted birds with tufted due to the lethal gene involved crossing tuftedXtufted.
Helps with keeping the poor fertility to a minimum and premature chick deaths too.
As for leg colour, its Ameraucanas that are supposed to have slate legs, Araucanas can have willow/yellow legs depending on colour variety.
That hen can very well be a non-showable representative of the breed, she certainly has the right shaped head to be an araucana(I always found that hawk shaped head and eye very distinct). She would make a great mate for a very short backed rumples tufted rooster since she has a nice fully intact rump and spine, fertility and hatchability out of that hen with such a roo should be great and and you should get some really nice chicks: tufted and rumpless, tufted and rumped and clean faced rumpless and clean faced and rumped.