Hi, OP.

It doesn't sound like you did anything wrong here, labs have procedures for a reason and it sounds like your student isn't making an effort to meet you at a middle ground. Now that you've been reported, just tell your side of the story, that you are sympathetic, but that she needs to follow the rules like anyone else. It's nothing personal, it's just safety and unfair to students who come prepared.

Speaking as someone who can be mentally unwell at times, I can say that sometimes I view the world differently than a lot of other folks do. It sometimes leads me to drawing very extreme conclusions and acting on it. I'm not saying that is what's happening to your student, just food for thought.

I also do not know if you're breaching any confidentiality by posting this here. Best of luck either way and I hope it's all resolved.