My mom beat her Lab with a dead (or so she thought at the time) chicken that it had attacked. I don't recommend that solution.
The best I could suggest would be to walk her by their pen, on a leash or harness, daily until she stops reacting. But chickens are stupid, flighty things and they make neat noises when a dog pounces on them. You may never be able to trust that dog to freely interact with your birds.
a former employer did something similar with his Rottweiler beat it with the dead chicken then wired it to the collar and made it wear it while chained to a tree till it started to be RIPE
now I am not saying right or wrong , it was a few decades ago a couple decades before that he was a professional dog trainer.
I am not aware of that dog ever attacking another chicken so it did apparently work.
probably send you to prison for that in 2022 for a long time.
while letting your baby momma murdering cell mate out for good behavior after 90 days
the thing about Pits and Rottweiler is that no bad behavior can be accepted , everything they do after 6 months old they do with a charge of (metaphorical)TNT strapped to them. the bigger and stronger the larger that charge.
no matter the behavior , the best Pit or Rott has the destructive energy well beyond most household breeds. the strength do grave bodily harm or kill an adult human.
the phrase often heard is there are no bad dogs only bad owners , well I don't fully prescribe to that. however it is in many was true , a good owner would never trust that kind of destructive force beyond their control and especially would not take any chances with it around things and people they valued.
back to the Metaphoric TNT , TNT was the more stable and forgiving explosive, it doesn't mean you would ride around with a case of it in your truck any time you didn't need to be hauling it. it means you would store it in a magazine where the blast would be directed up , in a very stable environment and keep it away from heat , flame , eclectic and anything else that could set it off.
dealing with powerful dogs is the same thing , no bad behavior can be accepted , special storage and handling must be taken.
people get in trouble when they treat these dogs like floppsy the dust mop Shih Tzu that a 8 year old by could punt across the yard if it miss behaved and attacked.
frankly Floppsy is often ill behaved because so much bad behavior is tolerated but since they hardly pack a fire crackers energy they are much less risk.
this dog has shown you that it goes "berserk" so you have a charge of TNT that can go berserk , wise storage is probably the best option. a strong kennel for the dog and it gets to come out under supervision it is more work for you , but I at least wouldn't let it out of your sight and pen it up any time you can't be there to control it or stop it.