Just want to follow up here and thank you for your help.
We lost her yesterday morning. She died quickly and peacefully in the run with her flockmates after spending one cold night inside the house. 
We had some babysteps of improvement on Monday and Tuesday. She was eating the egg, rice, and mealies and her crop finally wet down. We kept up with the M7 daily. Unfortunately she woke up Wednesday morning looking terrible. The weather went downhill too with wind and cooler temps. The yellowish poop came back and any energy she was gaining she lost and went the other way. She started getting the purple comb and wattles look Wed evening and I knew she was struggling for oxygenation. I made the decision to keep her inside for the first time instead of sleeping through a night in the 20s. My wife put her out at 10am, in the warmer sun, to let her be with her sisters. She sat with her the entire time and in 20 mins she stood up to poo a little, sat back down, gave a soft little gasp, and passed away relatively quietly. She’s back with her old flockmates buried in the back woods now. 
She definitely had some kind of underlying condition…I assume with her reproductive system. She lost a lot of the yeasty scent so I’m assuming the M7 was working…especially with the crop finally emptying. But with the other issues internally her time was just up. 
It’s a very tough loss. She was one of the originals and we had a strong emotional attachment with her and she did with us as well. The last 2 losses now have been very hard ones…to the point where you start questioning if you ever want to add to the flock again and just let the ones you have now live out their lives and just be done with it after that. Time will probably heal the wound, but this one is definitely going to leave a scar.
RIP Pige (real name Ethel, but we always called her Pige since she would always coo at us like a pigeon). Gone, but never forgotten.