As of yesterday, everything was completely fine with Moose. Ate on Wednesday, and because no one around sells appropriately sized live prey, scheduled to eat again today (also out cruising for food today, so she's definitely still feeling like eating... Her tank has a dark lid, so it's not weird for her to be out during the day). But this morning when I got her out to check her over like I always do, I noticed she's whistling pretty bad. Her temps stay in the right range, and she does soak her bedding quite often by flipping her water dish, but I usually catch that within a couple hours and replace it.
She should be about to shed, so since she's not showing any other RI signs like mucous/mouth gaping/tilting her head up, I think I'm going to give it a day or two to see if she's just about to shed. But if any other symptoms pop up or continue after the shed I'm going to annoy my vet by showing up without an appointment.

I've never actually dealt with an RI before, but I'm thinking I'm going to ask them to do a culture before prescribing anything. I realize that the broad spectrum stuff has a good chance of wiping most things out, but if it doesn't I don't want to waste that time not treating the real problem.