I think it'd be great if QR wore Jordanian designers too. And she does, when she wears her traditional thobes. And she wears jewellery by Jordanian designers, as well as traditionally embroidered accessories like belts. I wouldn't be surprised if they're made for the Jordan River Foundation (which promotes Jordanian handicrafts and products)
But for western wear, Arab first ladies and wealthy socialites still go for western designers. With the exception of Elie Saab, there aren't that many top designers of international calibre in western wear in the Middle East.
Even Elie Saab is somewhat limited because, until recently, he more or less confined himself to creating only gowns and bridal wear. I think it'd be great if he could start doing ready-to-wear.
Still, he has been successful because he knows how to create that perfect balance of traditional and western. He shows his collections in the west, to a western audience, and when you see his clothing on Hollywood actresses, it usually looks more western than middle eastern.
By the time his clothing makes its way into wardrobes of women like Queen Rania or Asma Assad, the designs are altered considerably for a more middle eastern look.
btw...since there is a new thread devoted completely to QR's designers, I think it'll be more appropriate for me to post info. on Jordanian designers in that thread.