Take a moment, won't you, and explain to us specifically how her portrayal of the doctor oppresses historically oppressed people, and please specify who these people are, where they live(d).  If you would, also explain what you mean by your assertion that she was using her portrayal to preach about herself and how you know this to be her intent.  I wonder if you perceive yourself as belonging to an historically oppressed people because if, for example, your heritage is Hispanic, then surely you know that the Spanish who sailed to The New World in centuries past were oppressors of the indigenous people if they were anything at all.