Just had Newt into the vet for a check-up, and, lo, she has been pronounced healthy! Her eyes look good, her nose looks good, and in general she finally seems to be a normal, healthy kitten! (Well, almost normal, anyway. She's still an itty-bitty little thing, but I don't think that's going to change much.) Can I get a hallelujah! Well, OK, there might still be a tiny, tiny chance that she has herpes, but it's extremely unlikely, since the corticosteroid ointment we tried last time usually makes herpes much worse rather than much better. The vet seems pretty sure that the final round of antibiotics finally knocked out her infection, which might actually have been chlamydia, after all.
Now, I just need to get her spayed, although the vet suggested waiting a month or so, just to give her poor, overtaxed immune system a little more time to recover. And after that... Well, I still don't know. Anybody want a healthy, adorable little kitty? Awww, come on. You know you do!