Will my python ever recover?

[Malum Argenteum]

It appears both nidovirus and inclusions are caused from contact with other infected pythons or mites. She certainly doesn't have any neurological or respiratory symptoms so, I think we can rule them both out. Although, there are specific swab tests my vet can do for these viruses. \

Both nido and IBD arenavirus can be carried asymptomatically for years, so they cannot be ruled out. And at least for nidovirus, swabs don't always pick it up (I don't know the ins and outs of arenavirus diagnosis). Arenavirus doesn't necessarily cause neuro symptoms, and secondary stomatitis can be associated with nido. This is not to say that either of these should be a concern, but only to say that they aren't ruled out by the reasons mentioned.

I personally would not even blink at the weight variances you listed; 200g in a 8kg animal is less than 3%, less than the weight of a meal. I also agree that the enclosure could use quite a bit of enrichment.