She's MUCH MUCH better!! Up and acting perfectly normally. Not eating as much as I'd like, but eating SOME -- the mealworms were a great idea, and she eats those really well. She's also eating greens, whole wheat pasta w/ calcium, and I think a little layer pellets. She wasn't at all interested in the egg, oddly, but I popped some pieces of scrambled down her anyway.
I talked to the vet on Sat. and he said, re: her so-so appetite and loose poops, that all that is probably due to the antibiotics. He says he finds in cases like this that they get better to a point and then plateau, but that once they're off the abios the appetite returns. But that I need to keep her on the abios b/c if it IS egg yolk peritonitis, she'll go back downhill if she doesn't get the full course.
So I plan to keep her inside until the abios are done. I don't think I can get the pill down her if she's in the coop, esp. b/c Clarice (Head Honcho Hen) is very protective of Olivia and will probably attack me if she thinks I'm attacking Olivia (which is pretty much what pilling her looks like!). I'm also concerned about her having to expend cals to stay warm, and I'm also worried that she may get treated like the new chicken after her absence.
So my plan is that when it warms up at the end of the week, I'll put her out w/ them during the day (assuming they don't hassle her), and bring her in at night. Then I can give her the pill and make sure she gets some special food before putting her out for the day.
She's got a nice setup inside -- I paved the floor of my storage room with papers so she has the whole thing. She's about as happy as it's possible for her to be, given that she's not w/ her flock!