She is still alive, still eating but still losing weight.

She looks the worst she ever has. I swabed her mouth and feces. Her boid and crypto panels were all negative from RAL. I'm fed her (2) medium rats, (350g total) last and she is no longer impacted with feces.

Does anyone know how I can make her gain weight? Can anyone make sense of why she is losing weight when she is eating more, test negative for most things and never has been in contact with another snake. She had mites when she was a year old but if anything were to come of that, it would have happened much sooner, correct?