My pullet is still alive, but looking worse - both legs now seem to be paralyzed (2nd leg stopped working a couple of days ago), although when I was cleaning her bum (since she can no longer move away to poop), one of her legs was twitching.  She's also not eating hardly at all on her own - just a few bites a day.
I keep thinking it might be Marek's, but thought that Marek's affected one side first - (like the leg, than the wing).  Both her wings work equally well.  She flaps them just fine everytime I try to open her mouth to give her a dropper of mash.
Even if she doesn't make it, I need to know what she has, so that I know what to do with the rest of my flock.  I have some pullets that I was going to sell, but don't want to infect someone else's flock.  
I updated my original post (the questionaire) today.
Edited to add - Besides moving her wings, neck & head, she also shakes her tail - but she seems so stiff when I pick her up - the bottom half of her (her two legs) don't work.  
I just finished giving her a second dose of the mash - about 11 dropperfuls.  She won't eat on her own and seems to hate being fed.  She won't even drink when I put her beak into the water dish - I give her pediatric electrolytes by mouth (force feeding).  She sleeps most of the time, but looks around alertly if she hears a noise.