Well she survived the day, but is even more critical now. Very labored breathing, laying down, eyes closed. Tucking her head mostly.
I started the flock on corid, and syringe-fed her 2ML of the treated water. Also 1ML of yogurt (I'm backing off on the vitamins/fortified shake, everything says not to give vitamins/electrolytes when administering Corid. She eats whatever I can place in her beak, so I'm doing that rather than putting the syringe down her throat/near her respiratory vent. I don't have the materials to tube feed her at the moment, and honestly the mild stress of syringe feeding her is enough- the tube feeding looks like the stress might just put her over the edge at this point. Especially since she took such a bad turn with the stress of her bath- I'm feeling awful that we couldn't blow dry her, even though it killed hundreds of lice. I will continue to syringe feed her, with yogurt and eggs, every half hour or so. I'll also get some water down with the wet foods.
I just read that you can give her a full day's dose of Corid undilluted, which I will administer with the next round of syringe feeding. Looks like .02ML per 100g of body weight, and she maxed out my gram scale with a 300g limit. She's very thin and young for a Bantam, so I'm going to aim for .06ML, but keep her on the medicated water. From what I'm reading it's hard to overdose on the Corid, and she's not going to get a full day's worth of water down this evening anyways.
She's inside the house now, and I'll set her on top of a heating pad on low heat, with a towel between her and the pad. I don't have a space heater and it's 75 in the house now. Hoping for the best...
Thanks again for the tips everyone. Here's hoping she lasts another night.