Don't take for granted that working for DND is very special. After all they are just ordinary public service employees, the same as others in other departments.
I would think her position at Loblaw would be sort of Leadership rotation program for new graduate, which is definitely comparable to a government job. I am not suggesting which one you should take since it all depends on her personality and career ambition. But definitely a DND job is not considered as prestigious as some other people thought.