I'm guessing this is the problem gal? Gosh, that sounds like one tough case - thanks for trying so many things for her! The vitamins recommended by Judy are most definitely human vitamins, but for children, and in liquid form. they DO NOT have iron (which is very hard on their organs) - they are not a powder or tablet, so not sure what you have that you're trying to give her.
I would STRONGLY recommend learning how to tube feed her, as I fear she's becoming dehydrated and malnourished...it sure sounds that way. Tube feeding is very easy, but it most definitely can be dangerous if done incorrectly. Chickens can die more quickly of dehydration than anything else, so it's imperative that you get fluids into her and good quality feed. You can try (for the feed) baby bird handfeeding formula - available at most pet shops. It's a course powder, you mix water (or water with electrolytes/vitamins in it!!) with it to whatever consistency she'll eat. If she likes it wetter, just add more water. But, that stuff is loaded with vits/mins that'll really give her a boost...in my humble opinion, you need to get her nourished and hydrated before anything else. BEST of luck!
I'm not allowed to buy any special poultry things because of my parents. "oh, these will work just as well, they are the same thing" "vitamins won't help if there's something wrong". I know chickens have very different vitamin/mineral needs. That's why they aren't NORMAL. Nevermind, this failed.
I have got some vitamins which are just vitamins, no minerals, because all the vitamin/mineral tablets have iron in them >.<
The ones I posted this thread about failed. Even I couldn't take them, so I don't blame the poor chicken.
So, these new vitamins are fine. She will eat them, but I'm only giving her tiny amounts since they are human vitamins and she'd probably get too much of one thing and not enough of another.
She's drinking, I follow her around with the water, not that she moves much.
I'll try to persuade my parents to get something like that ("*gasp* to spend that much MONEY on a CHICKEN?! it doesn't even lay EGGS!!"), it sounds like a very good idea
Yes, malnourishment and starvation is the main problem.