People can sue for anything. If it’s $300 then it will likely end up in small claims. In several states, small claims doesn’t allow attorneys. You’ve done your due diligence (tracking, photo, claim). This issue will be resolved before angry lady gets a court date. Also, the other poster that said people who are going to sue don’t tell you - that’s been experience as well. She sounds like she’s trying to create pressure to force you down a course of action.
There wad a survey done by Solnick and Hemenway that gave people a choice of working at a company making 100k a year but your coworkers all make 200k OR work at a company for 50k but your coworkers make 25k. Out of 250 participants, about half chose to make 50k. It’s a wretched thing, but that’s how many people are wired.