Final answer:
The correct word to complete the sentence is 'libertarian,' which refers to a political philosophy that highly values individual freedoms and minimizes government intervention.
Step-by-step explanation:
In the given sentence, the word libertarian best completes the thought. So the sentence would read: "Someone with libertarian beliefs advocates all types of freedoms, even those that she does not practice." The philosophy of libertarianism emphasizes individual freedom and is skeptical of government intervention in personal liberties. This political philosophy aligns with the idea of advocating for broad rights and freedoms, which is consistent with the context provided in the original question.