Just heard from the vet, and the sample showed up negative for parasites, which is good.

I'm thinking maybe the parasites she had may have somehow permanently affected her system? Doesn't seem to be a huge effect, but she nearly died from that whole ordeal so I'm thinking some mild damage to the organ systems might be expected... I've seen her poo go a really bizarre grey and green (just not this much) a couple times since she had the parasites, and always when there's some sort of stress factor like recovering from that surgery or something (if she's gravid that might be it?)
Since she seems to feel perfectly fine right now I'm going to carry on like normal I think... I don't know of any tests they could do that wouldn't be more dangerous than I'm willing to risk on a snake that is acting like she feels okay.