NOW WE'RE TALKING, LET THE SPECULATION BEGIN!!
So, it seems only natural to assume the 'he' and 'she' the voice speaks of refers to Fen'Harel and Mythal. "She Speaks. She's Fallen." This describes what we now know of Mythal pretty accurately. "Go to him." As in, go to Fen'Harel? You know, that 'Solas' guy who's whereabouts and intentions are currently unknown? Yup, sounds about right.
But it's the end of the message that gets into the really heavy stuff.
"Calling. The Calling!"
There is nothing else in the DA universe this could refer to other than 'The' Calling. As in, The Calling that Grey Wardens suffer due to their connection with Darkspawn.
Woah.
The implications of this are far-reaching indeed. The first and most obvious being that the ancient elves have some connection to Darkspawn, they'd have to, to know of the calling. That would mean that, at the very least, Darkspawn have been around for far longer than we thought. Perhaps Corypheous and his Magisters were not the first after all.