She literally has a seat on the nation security council, meaning she is directly involved in all decision making surrounding US military interests and foreign policy. She sat in the “situation room” and had a direct say in US foreign policy decisions.

She participated in decision making surrounding US participation in the ethnic cleansing of Palestine. Its really not disputable. The VP used to be far more a ceremonial position in the 19th century. In the modern era this is not the case.