This sounds like it could be mono. It's possible she's septic from various sources but I'd think they would have been ruled out by the clinic you went to.Has she been getting worse or does it seem like she was bad at first and has stayed at that level?What does she doe for work? Has she had any sick contacts?
Exactly. Ive seen a couple cases like this. Id still recommend for OP to have her checked in the ED. Would rather not miss another explanation such as underlying infection and like others have mentioned possibly sepsis. Id suspect an infectious source will need to be ruled out first as it can then be treated with antibiotics and is more lethal. If nothing is identified from labs/imaging maybe further pursue labs to rule out rheumatoid arthritis.