Because she was lied to by absolutely everyone. Why is this hard to understand? Beatrice at least was honest in her presentation of the format, if not the intention of her conversation with Battler. By your ideas, no one - Battler included, mind you - was ever honest to Erika. None of her powers were real; anything she did, she did because someone threw her a scrap and claimed it was her own doing when it clearly wasn't. The Logic Error was just another trick to convince her that she had any measure of control when in actual fact she didn't.
If Erika cannot even rely upon the perspective she's told she has and the abilities she has supposedly been given, then she existed solely to be manipulated and destroyed. She was of no use to Bernkastel from the start, she was no threat to Battler, and Lambdadelta screwed with her freely. And why did any of this happen? There was no reason. They did it for nothing but witches' cruelty, every single one of them.
No wonder she tried to take vengeance on them. They deserved it.
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