This is a fundamental misunderstanding of our system. She has a moral, democratic, and legal duty to follow the directions of the legislative branch, as expressed in law. So does every other member of the executive branch in all matters covered by law. Including the president.
Trump, as head of the executive branch, should be doing that: he should be carrying out the laws passed by the legislative branch. His failure to do so does not impose a duty on the rest of the executive branch to fail in a similar fashion.