It is a complex issue and deserves a full conversation. It’s hard to say what I would do in her shoes, but it probably would be to copy a personal letter a bunch of times. The context of the letter would, of course, be a general warning about circulating hate speech mail trying to misinform people, and be wary of what you read.
Maybe not fired for a first offense. That’s a bit extreme imo.
In a different scenario, what would you think if it was UPS or another private company worker instead of federal?