What strikes me about this story—apart from the obligatory angle of OMG the SIS is spying on people!—is the following line:
Awesome job, dudes. Note to self: in order to evade NZ's top intelligence people, just get married and change your name. SO SNEAKY!
The file continues to track Leadbeater's life, although the SIS lost track of her when she married and took her husband's name.