It's probable that she's a
Watcher of the Bronze Dragonflight (not the be confused with the Warden variety). We've met others, especially in Silithus. They're like the Keepers of Time and the Timewalkers - mortals that help the Bronze Dragonflight (similar to the Cenarion Circle for the Green Dragonflight). Considering she has a similar title to other Watchers, this is the most fitting.
The difference is, Watchers were given immortality by high-ranking Bronze dragons for a specific purpose. Xanataur was one of the first druids (over 10,000 years old), and he was given immortality by Nozdormu himself to be a historian for the Bronze dragons. Perhaps Ralo'shan is meant to be a historian (and prophet) for the War of Shifting Sands, as well as keeping an eye on the Qiraji/C'Thun for the Bronze Dragonflight in the end. That's what two others were blessed for in Silithus as well.
It's also interesting that her quotes from Vanilla foreshadowed the Cataclysm and Val'sharah. But, I doubt they had much more meaning than that.
Since she's dead for good now, it seems that the sheer power of Sargeras' attack on Azeroth was enough to break her blessing. Which, in the end, makes sense, since dragons were given their powers through the Keepers, who were given powers by the Titans.