"Need medical and legal advice for my mother" - Then go see a doctor and a lawyer. Or do you expect to get expert advice from a free public Q/A site, where you have no idea if the people giving the advice really know what they are talking about, and know the laws in the unknown location you live? And, no one on this site was there, and no one here is able to get the doctor's side of the story. We have only your side of it, and you were not even the patient.
Basically, the doctor doesn't have the best "bedside manner", but since your mother is refusing the treatment he has, what do you expect him to do? Keep her in the hospital and keep running up the bill?
*EDIT* - As you said, your mother stopped the treatment and refused it. Instead, maybe it would have been better if she asked for something for the pain, and continued the treatment.
And I would really like to hear the doctor's side of the story. You are emotionally involved int he case from only your mother's side. It's very natural for you to take her side of the case, and only provide information that makes the other side look bad. As they say, there are always 3 sides to every story: Your side, his side, and somewhere in between is the truth.
First, as someone has already mentioned, in an adversarial system such as the US courts have, all charged with a crime have an expectation of zealous representation.
I know many defense attorneys who are able to separate the conduct of a client from their role in ensuring the state meets its burden of evidentiary proof. In other words, they see themselves as ensuring the state plays by the rules and has a solid enough case to warrant a conviction in the face of a competent defense.
Of course, I also know many defense attorneys whose personal ethics and morals won't allow them to accept certain types of clients such as accused child molesters. Many of those also tend to have client interview forms (or ask during an initial conference) which ask whether the client actually committed the offense charged. If the client admits guilt, they'll advise him or her that they won't plead them 'not guilty' unless the client has a mitigating factor or an applicable justification defense. Instead, they'll advise the client that they'll do their best to work out the best plea they can/work to have charges dismissed or reduced.
And then, yes, there are those stereotypical defense attorneys depicted in media who don't care at all what their client may have done as long as they don't have knowledge of it (an attorney can be disbarred for suborning perjury if they allow testimony that they know to be false). For them, it's all about client billings and the comforts attendant with money, regardless of the source.