How strange to find a hen wandering in a car park, but great that she found such a good home with you. Do you have both the young abandoned chick and the Barbu D'Anvers in the house together and if so, how are they getting on?
Did one of your ex battery hens go broody? If so, that's pretty unusual. Are your chicks araucana x red sex links then? How did they turn out? Do you have any photos? I believe the blue egg gene is dominant so hopefully your pullet chicks from the Auracana will grow up to lay blue, green or perhaps olive eggs. That will be interesting! Do they have moustaches(tufts)? All of my araucana cross chicks have them.
Tasha, who is hatching my current brood was bought at auction as an araucana, but she doesn't lay coloured eggs, so obviously not full araucana. She's a tremendous broody hen though. She hatched 14 out of 14 of her own eggs from the cream legbar rooster in her first clutch and she had accumulated another 14 in her secret nest for her second brood, but I wanted more exchequer leghorns because a dog had just killed my leghorn rooster, so I gave her 10 leghorn eggs to hatch instead this time. There are now 9 out but the last egg hasn't pipped yet, so not sure if it will hatch. It's only day 22, and she is sitting tight still so it has every chance.
This is how the "chicken maths" gets so totally out of hand though!..... 3 broods this summer and 30+ chicks to show for it! My winter feed bill is going to be enormous!
Anyway good to hear more about you and your flock.
Best wishes
Barbara