That's beyond pathetic, it's actually alarmingly dangerous to have such a rigid---not to mention, medically illiterate---approach to medicine and science. She's beyond myopic and actually blind. Not to insult you by association, lol, but she really should not be practicing in any capacity. I know whereof I speak, since I lost my husband to an easily preventable medical error which his doctor arrogantly refused to acknowledge. He refused to review my husband's medical records, which would have shown a flashing neon sign that he was fatally wrong, dismissed us to hospice instead of treating the medication side effect that it was. Your sister's behavior is the analogue to that.