Mom and Dad met with the Docs and Hospice this morning regarding my grandmother's condition. (She is dad's mom.)
They pretty much confirmed that any type of major surgery is not an option, as it is likely that she would never make it through the procedure, given her state. The decision was made to 'let nature take its course' and slowly let the infection take over while trying to maintain her in as much comfort as possible, through medication. The docs did state that she will likely be in a fair amount of pain at a certain point, but it is hard to tell since she can no longer communicate.
Please keep her in your prayers, as well as my dad (and mom), as they are the ones on whom this decision rests.