New to chickens and one of my girls is ill please help.
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Can you get a picture of the poop? What did you use to worm them?
I have never heard of that so had to do a quick search. Which you giving, the tablets or liquid? What is the main ingredient levamisole or fenbendazole?
That looks like it could be blood. I would begin treating for coccidiosis as soon as possible. You'll need to pick up an anticoccistat such as Corid or Ampro. The active ingredient you need is amprolium. If you go get some then let me know what you have so we can get you proper dosing amounts. Also, I don't think the ivermectin topical is working. What you have may be good for external parasites but ineffective as a wormer in spite of what the package says. You will need something more effective preferably something with the active ingredient Fenbendazole such as Panacur 10% cattle and sheep wormer.
If it were me I'd definitely treat for Coccidiosis.
Are you in the UK? Harkers seems to be a UK product, I'm not familiar with it.
Harkers makes "Harkers Coxoid" liquid, which has amprolium hydrochloride 3.84% listed as the ingredient.
Says it's for pigeons, so you'd have to work out the dosing I think.
The amprolium I use is Corid, which is 9.6%.
There is also "Harkers 3 in 1" which says it's for coccidiosis, but I can't find the ingredient list.