Here's the Executive Order.
Executive Order: Border Security and Immigration Enforcement Improvements
Here it is annotated:
Trump's Executive Order On Immigration, Annotated
The AG has a staff of highly qualified lawyers who must analyse every section of this order to determine legality based on the law -- not on political viewpoints -- following which directives are issued regarding enforcement. That requires them to interpret it so you are wrong when you say she should not "interpret" it. It is not only her obligation to interpret it but it is her duty. If any parts of the EO breaches any law then she has no obligation to enforce it -- but that only applies to the parts that breach any laws. She cannot fail to follow it in its entirety because it is bad policy. It is not all or nothing. She must enforce sections that may be bad policy but do not breach any law -- or resign. The Courts will not overrule the entire EO -- only the parts that breach any laws. She knows that but she refused to enforce any of it. That was wrong, in my view.
As to lawyers not interpreting, but only judges, that is wrong. The job of a lawyer is to interpret. They do that on both sides, argue their positions, and the court is the final arbitrator (subject to appeal). She has to do that interpretation, in good faith, based on the law, and not her personal or political views. And until overruled by the court, her interpretation is the law. That's how the system works.