She probably will never get along with everybody else...unless you let all the young ones mature....and then put Bertha in with them...in that case she will be the new comer to an established flock....that might take her down off her high perch...or she will Lord it over the whole bunch...you'll...
Don't put her in with the bird she was Eating!!! Bertha is well aware of who Percy is and what she was doing to her...chickens have been proven to recognize up to 50 or more flock mates...placing the picked on bird in with the picker is only reinforcing the picking problem!
Do you own any books on chicken care? If not I would suggest you get one....the one I bought almost 20 yrs ago is written by Gail Damerow.."Storeys guide to Raising Chickens" you can find it almost anywhere....online, bookstores, the library. It an invaluable font of information! She covers just...