Should diverticulosis leading to peritonitus leading to septicaemia be detected.

Please forgive me the long question - any help would be appreciated.

I am seeking independent medical advice regarding the condition when diverticulosis leads to peritonitis and then to septicaemia. My Mother has just died from complication a result of this condition.
She was admitted to hospital and under went surgery for an abscess that had formed within a diverticulum. After almost 5 weeks IN HOSPITAL another abscess was discovered through a CT scan (the first CT scan during her stay!) - at this point she had peritonitis and septicaemia and the subsequent surgery was too late to save her life.  I believe her situation was neglected and the second abscess could have been detected much earlier if the doctors had been more vigilant - after all she was in hospital all this time.

I would be grateful to hear from anyone with experience e.g. would the symptoms have been noticeable by vigilant doctors? She had pain and could not bear to be moved for a couple of weeks  before the second abscess was diagnosed - she sometimes was feverish.

Many thanks in advance
regards
Martyn