I don't think you'll have any luck getting arrows for it in the USA, unfortunately... But I can help you out if you mail her over to Australia, as we've got a few over here that would work!
Mate, lookin' at your list of weaponry, you've got some real beauties, and nice draw weights, too! All the best with your elk hunt, and I'm sure you'll get some arrows for her just fine!
My mate uses GT 75/95s out of his 70lb Black Widow longbow. Yours would have more "ooomph!" than that, but you could still tune it up, as he uses rear weights.