Hi Barbara,
So glad to hear the pecking order has finally calmed down. They will forevermore have pecking order altercations from time to time. Such is the life of chickens!
However, I am a bit concerned for you that you are putting in new chickens like the new Araucana right in with your established flock. Adding new chickens without separating them and waiting a few weeks is a biosecurity concern (in case you are not aware of how important this wait actually is). With new chickens (even from reputable sources like a breeder) there should always be a 2-3 week separated quarantine period away from the established flock to make sure they aren't going to bring outside sicknesses in. Some are very serious.
New chickens can harbor all kinds of infections, as they are masters of trying to hide weakness for as long as they can. If you haven't already, check your new chickens for mites and lice at the vents (check at night with a flashlight). Check their legs to see if there are raised scales (scaly leg mites can't be seen by the eye.) and do you know the last time she was wormed? Also watch for respiratory issues like coughing or sneezing (etc), or lethargy. Study carefully the new girl's poo- it shouldn't be green or runny. Hopefully, there are zero issues.
We recently purchased a flock of expensive adult French Black Copper Marans from a very reputable breeder. Got them home and saw that the roo had expelled a large dose of Roundworms in his droppings. After carefully quarantining them (we do that anyway) all the new chickens were dewormed some days later, and one roo became so ill (we believe from having such a large wormload) that he soon afterward quit eating and drinking and lost weight- we thought he was going to die. We had to tube feed him (etc., etc.) before he was better. Now, if we had just placed the FBCM in right with the established flock, we would've had them all at least possibly exposed to Roundworm, but it could've been worse. Sometimes it takes awhile for issues to show up.
Anyway, hopefully there are no issues and all remains well.
Best wishes!