My 2 females challenged each other for the higher status as well, but Abbey is 50 pounds, and Jada was around 80.
You have been given great advice, I hope the behaviorist can help you out. I was all set to call one in, and the girls worked it out on their own--no blood--one day, Jada walked over to Abbey, and Abbey just rolled over on her back, and that's what she does to this day. It took a few weeks, and they were NEVER left alone unsupervised, but we have a happy home again.