Who would have even thought to kidnap her other than a family member?
Who kidnaps a senior citizen, that is in her last days, for a ransom? I’m sure Lurker is right that she is gone, and these geniuses didn’t realize an elderly person isn’t that best choice to keep as a long term hostage.
It’s likely it’s someone that had a connection to her thinking this was going to be quick and easy, snatching a frail old woman. At this point something went wrong with their plan.