K_Z, I've always had a strong feeling that she was rushed back to O.R. for ligation/ cauterization of bleeders.
As a nurse who has worked in MANY different intensive care settings, I know the space is really limited as far as surgical instrument packs, cautery units set up and blood transfusions would be all at the same time.
I would expect to see all of the above equipment, plus a CRNA and Anesthesiologist tubing her first, or maybe the Code was first and she would have been tubed there, of course.
But, having had post- op bleeders, we didn't leave them in ICU. OR staff came and together, we ran with our bleeding patient back to OR to the surgeon who had responsibility for the patient's post op course. Sometimes, well, you can imagine that there are still probably blood splatters on some recessed spotlights in some ICU units....
The reason the family may not have mentioned this in their disjointed narratives with " wandering truths" is because once she was out of PICU, she was out of their sight. You really can't talk much about something that went on behind O.R. doors, if you weren't in O.R., right?
I confess that O.R. was always like " another world" to me. I could not stand any part of it even as a student nurse... I avoided Surgical Rotation in Clinicals ha... but I am glad there are people like you who are there.