I don’t really have an answer for you, but I know from my personal experience that the bile drains and infections go hand in hand. I’ve not had some of the symptoms you describe, but I kept getting infections in the tubes (at least once getting into my whole bloodstream). I spent most of February in the hospital because of that.
Has your mom’s oncologist brought an infectious disease specialist on board as part of the “team.” Mine did and I thought it was really important. I’m taking IV antibiotics, which I can administer to myself via picc line. Since getting on them, I’ve quit running fevers and haven’t had the infection issue.
Just a thought to see if that would help your mom.
Lisa