Hi Everyone,
This morning Ruby's crop only had a marble-sized pliable nugget, which is sort of back where we started (but it got worse in the middle there, so this is good news). I locked her in jail with apple cider vinegar water while I changed out all the other waters in the main run. Then I gave her a few 0.3mL "sips" of the spicy lemon concoction. Since she HATES being syringed, I let her roam around in the big run with her friends immediately after this treatment and raked out as much bedding and feathers in the little coop as possible. However, being with friends did not last long, as she started eating feathers!!!

Needless to say, I put her back in jail right away. So far, there is only a raw egg in there for her to eat (I don't think she's touched it yet), but she's having a good time digging in the dirt that is now exposed since I raked it out. What else can she eat if I'm keeping her off yeast-feeding foods?
Edited to add: She never ate her chopped kale and chopped chicken breast yesterday, so I ended up giving it to the other hens. Also... should I be adding probiotics to water yet?
So I realized I either needed to remove all the feathers from the run (not really doable) or find a way to make them less appetizing. Last night I wetted down the side of the run that has most of the feathers and this morning mixed it all up with the bedding and dirt underneath. Now there aren't so many tempting downy fluffs all over the place. I will continue to do this so it isn't a feather buffet.
As of right now, I am feeling a bit better about Ruby. It seems her crop issues may stem from the feather eating. I was afraid she might have another illness (I realize she still might, but am enjoying a morning of feeling a little better about the situation). Maybe she did in fact impact her gizzard or somewhere further down, as she had watery poops for weeks. This morning in the mini coop I saw her drop a REAL TURD! It wasn't huge, but it did not come squirting out, either.
I will continue confinement, limited diet and administer yeast busting measures.
I agree with @TwoCrows that Ruby has doughy crop. I ordered Fluconazole and will pick up Miconazole Nitrate, since she refused the ACS water, but I'm not sure if I will administer anything at this time (besides syringing the spicy lemon with ACS mix.) Thoughts? I also finally made the crop bra last night (exactly as described in the article by @azygous), but don't know that I need it at this time. Would there be any harm in trying it out today?
Here's the tough part... with daylight savings, I will not see the birds really during this coming work week, so it will be difficult to assess how Ruby is doing. I may run home at lunch a couple times. Thoughts on that?
Thanks for everything! I'm learning a lot about these crop issues! Fingers crossed that we're on the road to recovery!