June 2014 is still over half a year away from your interview, so bring new stuff.
Bonus points for face-time (ie in person visits), and/or if she can be with you for the interview.
You will have to stick with the supervisor or ISO at USCIS that is handling your expedite request, hammer on that human via telephone until you get the answer.
if you included a reasonable letter in the request for expedite, then supervisory review should speed things along.
This is actually good news ,
as
the casefile is on a human's desk.
That human handles adjudication on the casefile.
It's been a bit - was the casefile approved during June 2014 or no ?