If she can afford it, I'd recommend a high quality stool test like the GI-MAP. You'd want to know if it is a protozoa or endotoxin-producing bacteria, or other pathogen, as different types of dysbiosis require modified approaches. I had Blastocystis hominis and Giardia infection, after a few days of low-grade fever it went away, but over the next few months my libido, strength, hormones, sleep, all tanked.

Did a long herbal parasite cleanse after doing the GI-MAP, along with several liver flushes in my case. Really helped. (Certain organisms can travel up the bile duct into the liver, gallbladder, and apparently even the pancreas, hence the liver flushes.)