It doesn’t hurt to drain he or try just in case there is yellow fluid in the belly. If there isn’t then you can rule that out. I have had hens with a full lower belly hang around enjoying life with the flock for months to a couple of years. I would only attempt draining to make it easier to...
Does the swelling in her lower belly show up if you take a picture? How does her crop feel? Does it empty by the next morning before she eats? An enlarged lower belly may be a sign of internal laying/salpingitis or water belly/ascites. I usually do not attempt to drain a hen unless she has...