Illness/Sickness: Adult Female Not Eating, No Obvious Symptoms

I have a 3 and a half year old female leucistic axolotl who hasn't been eating. It's been a week since she has eaten. Her usual diet is nightcrawlers, but now she won't touch em. I tried beefheart, her favorite treat, no luck. Last night I tried bloodworms, she didn't even care that I was dropping them right on her nose!

Physically, she looks totally fine. I was worried she was a little thin, but after looking at loads of pictures online, I don't think she is.
The only noticable thing is that her gills are red (not infected/irritated red, just full of blood red) all the time. Usually she is a very lazy axolotl and I'll often see her snoozing with her gills very pale as she relaxes. But now they are always red and I'm worried she is struggling to breathe. Is that a thing?

And her behavior is different, too. She's moving around more than normal and she has even been trying to bite me or chase me off a few times when my hand was in her tank (VERY abnormal for her). A few times I've seen her swim quickly upwards, touch the surface, and then zoom back to the bottom.

Twice I've seen her "burp" out singular large bubbles. Anything to that?

I moved to a new apartment 2 weeks ago, could this all be stress? Water levels are all spot on, the pH is a little (0.5) lower than at our previous place.
Two days ago I noticed her tank was running ever so slightly warm so with numerous fans I've dropped it to 68° F.

Tank Details:
20 gal (long), barebottom, mopani wood, a few anubias
Temp: 68° F, NH4: ~0ppm, NO2: ~0ppm, NO3: 0-5ppm, pH: ~7.5
Any help would be VERY appreciated!!!

I can't say I'm sure about the symptoms, but I can tell you that if she's moving around more than normal, bright red gills are normal. Axolotl gills turn red as a result of activity. When she goes to the surface and gulps air - that's also normal in most cases; axolotls have a set of lungs as well as gills. When they gulp air, they are just taking in oxygen from the air. Bubble blowing, from my experience, is also normal. Is there enough oxygen in the water?

Stress usually dies down after a couple days, 2 weeks is too long. She may be stressed from something else, but the move isn't it.