This is Dr. David
it sounds like her care has been totally botched and she has gotten poor care.
I am so sorry she has declined so much.
a ruptured bladder is very very rare.
usually patients will just urinate in their bed before the bladder will rupture.
if she has a rectal cancer or bladder cancer which was not properly diagnosed, then this can eat through the wall of the bladder and cause the bladder to leak and rupture open.
let me know if you have questions.