Maybe "all" was an overstatement, just like a vacuum cleaner doesn't necessarily suck up literally all the dust even if apparantly true claims are made otherwise.
Besides it seems like she was fat with anima, so maybe someone paid special attention that she got to where she should be (a bit like Bwonsamdi does with trolls).
Edit: Seems they changed it to the war of the shifting sands, because apparantly no exception was made for this particular elf, validating yout points. ^^