Hi again!
I'm here to update but the news isn't so swell.
I gave Blondie another spa treatment (she was sitting down this time in the blue bowl of warm water) for forty or so minutes. Her stomach felt less hard than it was yesterday. After the time was up, I pulled her out, dried her, and then gave her 250mg of calcium via syringe. The calcium was very very finely crushed and mixed with water. After two hours, nothing had happened. I started worrying while reading so many threads because all the success stories have chickens getting their eggs or shells out within thirty minutes to one hour. So I put Blondie in another bath but only for twenty minutes. After pulling her out and drying her, she started wobbling and walking really slowly by herself, like seven feet or so, and pooped out a small amount of yolk. Then I gave her three small syringes of apple cider vinegar water. (I just extracted water from their jug of acv water in the coop since that's already correctly balanced.) I've put her back in the laying box. It's 5:10pm now, and I put her back in the box at about 3 o'clock. I very recently checked back on her and she was sitting down. There wasn't any yolk near her, and still no shells.
I'm really afraid my little Blondie girl is going to die. Nothing has really changed despite the baths and calcium. I'll give her another 250mg of calcium tomorrow, though.
Anything else I can do? I haven't given her mineral oil up the vent (I don't have mineral oil though, and also her vent looks perfectly normal to me), and I also haven't actually put (cool?) water... into her vent via syringe.
Are you sure it was yolk she passed and not yellow poop?