Update: They already injected her with an antibiotic called ceftazidime.
I think I trust this vet, he seems to know a lot. He has multiple degrees surrounding herpetology and treated many reptiles, He was also president of a reptile group that I forgot the name of. He took a tissue sample today and sent it to a lab, I'll get results in a week.
His guess was an abscess or a cancer. He did an X-ray and her heart was normal, the growth/abscess is in front of her heart.
Because of where it is located, he won't do any surgeries if it is a tumor, I'm hoping it's just an abscess. He didn't drain it, so I assume it's still in the early stages? I'm going to the vet every 3 days for an antibiotic injection. Should I start the probiotics now? Or after the antibiotic treatment?
Thank you all for your help, I'm so happy I'm apart of this community. ❤️