That prophecy is actually fairly interesting considering it's a lot less mystical than the other prophecies floating around in the series and really blatantly a case of Cersei bringing about her own doom by treating Tyrion as an enemy until she finally makes him into one.

I like that thought, of Doreah being smart and practical enough to announce she's needed to tend the dragons and get them to eat, making the attackers keep her alive when all the other Dothraki were being cut down around her.