My mother in law is terminally ill, and she appointed her "was going to be ed" to be the power of attorney while she was heavily sedated. He is trying to stop her family members from visiting, and stop her son from staying in the hospital next to her! Can he do this???
So, I don't know if it varies from state-to-state, but I would check on the laws of your state and try to look into this.I think you should contact a lawyer. Someone above mentioned that she might not have been capable to sign. That's just one issue. Whether or not she was capable of signing, the lawyer should be able to get a determination on whether the POA can keep the family away.
Also, since rights vary from state-to-state, my POA rights probably differ slightly, anyway, as different states have different interpretations of our rights. So, don't take what any of us say here as the answer, but get an attorney in your own state to investigate this and, if applicable, to stand up for the rights of the family.
Good luck. You will be in my prayers. :)