if one of your chickens are brooding and is just staying there i would recommend just to move it to a separated place that’s dark and quiet are the eggs fertilized? if they are not you can take the eggs out and that would most likely solve your problem
my whole flock had this, this might sound cruel but what we did was we cut half of garlic and stuff it down her throat, i know it sounds cruel but it’s every effective trust me i used the it everyday and the chicken would stop gasping in like 2 or 3 days
update: i am back on my vacation, we’ve asked my friend to watch them and she did a good job on that, she refilled the waters and let them out of 3 hours daily thanks for the feedback though it helped a lot!!