I Just Recently Lost One My Of My Older Sisters

I just recently lost one my of my older sisters to Sepsis.She was already battling cancer of the colon and a tumor.The tumor was in a shrinking stage so when small enough could be removed.My understanding is she went to her Doctor that was treating her for gas,bloating and pain.He performed a non surgical procedure in his office.About 2 weeks later she was in horrid pain and thought it was the effects of Chemo.She was rushed to a Quality top 100 hospital.They found she had Sepsis.They tried to control it..but it spread throughout her body,dooming her.The family watched as the tubes and equipment was removed.The Surgeon I spoke with said there was a possibility that something was done wrong.He said..It could have been an unavoidable infection.She had a perforation on her liver.Could that have happened as a result by the previous Doctor by whatever procedure he might have done?