See that’s your first mistake is to trust her in the first place after she dismissed you countless time, but tbh I don’t blame you for doing the right thing and throwing expired ingredients away. Now thi is the petty (and self-preservationist) in me id I would if made sure to take pictures of the stock room with the expired supply then take pictures of the bottles with exoneration dates. And then when she threaten me I would throw do on if two things, take the coaching and go directly to HR and the Heath department and report her, or throw the receipts in her face and she what he does with that information. But that would be showing your hand. Report her ass and show the proof to the right people.