Okay you tie the chicken by it's feet to her collar and then strap it to her so that she can't chew it off. They used to leave it on the dog until it just rots off. Dog supposedly won't go near a chicken again. Yeah, right.
However a more humane way is to get one of those muzzles that people use when walking their dogs. the ones that prevent them from biting but they can still open their mouths to pant, etc.
Once muzzled take her into an enclosed area with a few chickens and have her on a 15 foot training leash, give her the down/stay command and walk away from her and have someone release the chickens into the area.
If she moves from the down/stay tell her no in a firm voice and put her back in it. Once she realizes that she must stay there and not move call her to you and praise her.
The next step is to have someone bring a chicken to her and let her sniff it. Have her in the sit/stay by your side. If she makes a move towards the chicken, again tell her no, put her back in position and try again. Keep trying until she no longer moves towards the chicken and they can bring the bird to her and she will just sniff it.
Finally, keeping the muzzle on her, let her loose with the chickens, as long as she doesn't charge the chickens or attempt to rough them up with her paws and just goes and sniffs them and walks away call her to you and praise her. If she attempts to harm the chickens, start all over again with the down/stay.
This next step is the tricky part, take the muzzle off her, but keep the training lead on her. Start all over with the down/stay. Repeat the exercises above until it comes to part where you let her loose with the chickens without the muzzle. Keeping the lead on her let her loose. If she makes any attempt to charge, chase or hurt the chickens, tell her no and then call her to the heel position and start all over again.
This, of course, presupposes that you have already taught her basic obedience commands and she has mastered them.
Hopefully this will help