Bingo! I think that's "it"! Antibiotics destroy the GOOD bacteria along with the bad they're intended for- they don't discriminate. Digestion depends on good "gut bacteria", & since "this all started 6 months ago...& was put on injectable antibiotics" may I strongly suggest that you start adding reptile probiotics to her food immediately to help restore her essential gut bacteria (upon which her digestion depends). Either Nutribac or Bene-Bac-"FOR REPTILES" available OTC, without prescription- & by all means discuss this with your vet- hopefully they'll both agree & also add this to their suggestions for future patients. FYI- antibiotics are very hard on a snake's body- they're sometimes needed, but they have a downside. They're not harmless.
And listen, you know your snake better than your vet when it comes to sensing something is wrong- snakes can be very subtle & a vet that only sees a snake now & then isn't going to have the same "feel" for subtle indications. The same thing has happened to me in the past- the vet couldn't find a thing but I knew my snake was ill...sadly I was right. Snakes aren't easy patients- they're so stoic.
Anyway, my gut feeling was that this had something to do with your snake's gut- it wasn't until you mentioned the antibiotics, then the "light went on" & this explains the symptoms you've been seeing. With any luck, I hope this will fix things. (& allow some time- it won't work overnight, damage to the digestive tract can take some time to fully recover) The easy way to add probiotic powder to your snake's meal is to pack it into the oral cavity- be careful when you pry the mouth open- those rodent teeth are sharp- then push the mouth closed & feed. I'd give it every meal for a while. And please do keep us posted?