Sure, that's all normal. Note that she says it's their obligation to give legal advice to the president and follow the law and Constitution. The Constitution provides that the president is the chief executive and oversees the DoJ. Right now, the minor potential legal arguments that have been put forth by commentators (not Ms. Yates herself; she provides no legal argument or justification) do not rise to the level of constitutional violations or anything that may imperil her oath of office.
Why is Ms. Yates comfortable allowing the judiciary to make its decisions on Mr. Obama's illegal EOs but not comfortable allowing it to do so on Mr. Trump's EOs? There's a reason we have a legal system with strict procedures and rules regarding argumentation, standards of evidence, etc. In ordinary conditions, a fair decision cannot be rendered by an attorney sitting alone in a room, and, barring a blatant constitutional violation, it's improper to redirect the resources of the DoJ based on such decisions.
Why is Ms. Yates comfortable allowing the judiciary to make its decisions on Mr. Obama's illegal EOs but not comfortable allowing it to do so on Mr. Trump's EOs? There's a reason we have a legal system with strict procedures and rules regarding argumentation, standards of evidence, etc. In ordinary conditions, a fair decision cannot be rendered by an attorney sitting alone in a room, and, barring a blatant constitutional violation, it's improper to redirect the resources of the DoJ based on such decisions.