I'm so sorry. It's terrible what these hens go through sometimes. I read this thread, and you did absolutely everything you could. She was lucky to have such a caring hooman.
:hugs
I had a hen with a similar issue. I put on a glove and put water soluble lubricant in her vent and fed her tums. It took a while, but she was able to pass a huuuge egg (poor Jessamine). But I found that a lot of the problem were the urates. Her vent gleet was hard to treat, but as soon as I got...