Is everything pre-determined in OOTS world?

[Morgana]

Fourth wall breaks aren't consistent powers characters can recall upon whenever they want, otherwise Haley could at any time take whatever item she had previously from another strip, which would be an extremely powerful ability, and there's no reason she'd only do that once. Ultimately the Oracle reading future books was mostly just a joke. If Tiamat can literally grant an ability to recall any information from anywhere, she'd be rulling the pantheon at this point, and considering how Thor was able to remember every single one of his worshippers, it's reasonable to say Tiamat would easily be aware of everything that will ever happen. Something she is not, cause we've seen her show surprise before.