When my mom was dieing in the hospital, even tho we had a living trust, durable power of attorney for health care, DNR, etc etc etc, her dr made me hand write a document, at oh dark thirty, telling him to unplug her. I did it, he did it, next morning he plugged her back in, pretty much all by himself. More money for those twice a day five minute visits to her room for him...
It appears your mother's physician committed criminal battery under state law, a violation of federal law, as well as a huge ethical breach and probably a violation of your state's medical practice act, not to mention possible insurance and/or medicare fraud. Having you write out your instructions was merely prudent, however. That's what I'd advise any of my doctors to do, in any such case.
These posts make it sound that doctors nation-wide are out of control. It worries me.
Jeff