Alright, good update and bad update. Good update first:
We went in and talked to the Petco where we bought her, and the manager forwarded us to corporate. We weren't expecting anything, but today in the mail we just got a check reimbursing us for her whole vet bill! Also, the woman who is in charge of animal care said she'd take the other chameleon Rosie was cohabiting with to the vet to get a checkup for the same issues.
Bad news: even though she's on antibiotic treatment, her respiratory infection seems to be progressing. She's sat with her nose up and mouth open a couple times even when I was in the room, which I understand is a pretty bad sign. I want to double-check my husbandry - nighttime is about 65 F, humidity about 80+ (variable, I have a fogger going that goes through most of the night but the edges are much lower humidity than the middle, which is probably closer to 100%) - daytime I have the headlamp at 84, since she was climbing on the screen trying to get to the heatlamp when it was at 81, bottom temperature at about 68, humidity between 35-45 (it's lower with the removal of the live plants - I've been misting once in the morning and evening, and then dripper midday).
Should I call my vet again?