Unless the worm load is obscene, you will not generally see worms, they are usually microscopic. Also, in the poo one looks for eggs as noted in the second link.
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Hi, I'm sure your hen is suffering from something reproductive while she could have worms I suggest not trying to worm her right now as this could send her over the edge so to speak because worming initself is hard on there systems , concentrate on getting the egg out of your hen if she even has one present? Or if she is suffering from internal layer or eggyolk peritonitis she may need antibiotics at the very least , really the best thing for you to do is get her to a vet as I also have a hen with this condition and she whould have died without a veterinary care. She is now living just fine and gets a implant place into her every 5 months , I am very sure your hen has a internal egg layer problem and peritonitis is slowly setting in she needs powerful antibiotics at the very least, like Baytril injectible or amoxicilin! Then she needs to have her abdomen drained, your hen looks like a production hybrid and they are quite prone to thease conditions because they are egg laying machines so to speak, plaease talk to a very informative member hear on BYC called Speckled Hen if a home procedure is how you want to go about this and please DON'T waite as this is life threatening and VERY painfull for your hen , best wishes