I don't think that TSC sells wormers for chickens that get tapeworms. Last I looked, they only sold Fenbendazole, Ivermectin, and Piperazine. I guess if you used Zimecterin Gold horse paste, that would kill tapes.
I am sorry for your losses. I don't want to sound insensitive, but is there any chance of having a necropsy done? California does free for residents and lets you use their FedEx account number to save on shipping costs. I'll be doing my own today... Maybe you could do one, too? Again, I don't...
I hope yours does better than mine... I noticed that one of my hens was acting ill, so I brought her in last night, gave her some Baytril, but I guess it was too little, too late. She just died. I will do my own necropsy in a few hours a post my findings.
Sometimes you need to soak them several times to get the egg out.
Did you read this thread?
https://www.backyardchickens.com/t/728469/not-sure-what-is-going-on-very-worried