Was there anything more these daughters could have done to at least be able to find out if their mother was dying? No, not with Sharon in charge. She was hateful, and it was perfectly legal.
Sharon forced the daughters to go through her for any reports on their mother's declining condition. Never mind that she seldom talked to the doctor and didn't know. Sharon didn't care. She got to have control over a lot of people and she was thrilled by this.
What can all the rest of us learn from the daughters' nightmare?
The lesson here is to take the time to have an honest conversation with adult children about appointing a power of attorney before you lose your ability to make decisions. Disease,dementia, strokes or anything else can cause you to become incompetent.
Be open and honest. Don't be afraid of hurting your kids' feelings. Talk about all of it. If you go outside the family to appoint anyone as your agent for healthcare, be sure it is a compassionate person who will work with, and not against your family.
Myrtle didn't do that. She then became incompetent as time passed. No one could change the power of attorney after that. Her choice to use a lawyer was an unfortunate one, because this particular lawyer knew just how to twist the law for revenge. Sharon was an angry, maladjusted person. Be careful whom you trust. This was a terrible choice of power of attorney!