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Hi Kotiya,
The best thing to do is take her out on a long line with a snug fitting prong collar. Wait for her fixate on a chicken, then tell her to come and give her a strong pop on the lead and reel her back into you. Have her sit in front of you and praise like crazy. Release her from the sit with a big "okay". Do 10-15 reps during each lesson, then put her away so she can't have access to the chickens. It'll only take about 20 minutes of your day to do this is if you zip through the repetitions.
After a week to 10 days, take her out with a shock collar and the normal long line with prong collar. Do a few of your previous reps using the long line and then make a big show of unhooking the leash. Release her and when she even looks at a chicken tell her to come. If she comes, have a praise party. If she doesn't, issue a loud verbal "ah-ah!!" and if she comes a praise party, if she doesn't, give her a correction with the shock collar and pat your legs to get her to come to you.
Make sure you're not over stimulating her with too high a correction or she won't be able to think clearly. Don't use too low of a setting or she will ignore it. Wetting their neck thoroughly before putting the shock collar on and fitting it very snugly will ensure your contact points are working. I like to fit it to the SCm ( the long muscle on the side of the neck) instead of against the throat where their loose skin can interfere with the contact points.
The reason you teach them to come before you apply the shock is they know what to do instead. Dogs need to understand what they're supposed to do before they can appropriately respond to a correction. Then they know that the correction is for not complying to the recall and they understand what they are being corrected for.
After awhile you will need only to put the shock collar on and won't even need to turn it on. Then you can eliminate it all together because she will know that chasing chickens is taboo.
I've been training dogs professionally since 1994 and this works. You may have to stay on her and watch her for a couple of months but this should do the trick on a Lab.