Family Reunions work differently in Brazil from the US, as far as my layman's knowledge goes.Â
In the US , you could be approved after a lengthy process, and they would still require a follow up interview with the  sponsored groom or bride. Mail Order Brides, Green Card arrangements are a common place there. So INS officials follow through what's on their plate of cases to avoid being taken advantage off.
With Brazil, there is the presumption of foul play, under the general assumption this might be an arranged marriage. In Brazil you are presumed guilty until proved innocent, and in the US, theoretically, is the other way around.Â
Brining the wife to your country to lead the interaction with Brazilian Consular staff is a better way to deal with this, as others here suggested.  You can fill as many form as you wish, beat your drum as loud as you could, make as many inquiries as you desire, and yet, your application status would go nowhere.Â
Besides, you have no pull on the Brazilian side of what is their sole prerogative. Whether you are bound to Brazil or the US, having an insider track makes all of the difference in getting your application speedier review.
 And chances are, if you picked up your wife out of some online exchange or a straw hat, she has no connections either. She is disfranchised as you might be. Two peas in the pod, and not a lot more to it.
In the US, if I had some relationship or belonged to a Congressional District, and I being an active party delegate, or activist, my representative staffer would make a few calls in my behalf, and things might get sorted in my favor.   In Brazil, Congressional Votes are not District based, they are a-large, so her chances with her Congressman are as good as any, meaning Zero favors to be cashed out and granted to her.Â
Historically speaking , Brazilian Immigration policies only allow the floodgates wide open when there is an acute labor shortage in the Country.  And the last we had was somewhere between when slavery was abolished and up until after WWII when the Country went into industrialization overdrive.Â
All others that came in here afterwards, did so through either illegal or humanitarian refugee grants, and in terms of contingent, goes, they  were token sized immigration initiatives.
if they start letting a few Pakistani or Afghani emigres, they could unwilling open the floodgates to more than they would be willing to grant legal residence. And I am sure they don't want that.
And I doubt Brazilian public officials haven't been notified of any demographic imbalance that might threat the Country's economy to the point of allowing the gates open.
I told this before, ...... Ditch the Brazilian one, and get yourself a Russian one. I was not kidding.