Most at will employers have written policies which govern terminations. And yes, that can cover behavior outside employment which can impact the employers reputation. Note 79, they reference racism as the reason for not termination, but putting her on administrative leave pending investigation. 27, 58, 69, 74, 86 all reference the bird watchers behavior before the video, in his own words. She may well have felt threatened, certainly her dog was. If all their is is describing the black man who threatened her as black to the 911 operator, I'd speculate she'll be back at work. You're right, she won't have a shop steward arguing her case, likely an attorney who might love to pursue the case.
I can't take you seriously; I think you're trying to save face.
I would like any woman following this thread to identify herself as such and state publicly that the words, "I am being threatened by a man in the Bramble. Please send the cops immediately." could be taken to mean something other than, "I believe myself to be in danger of rape or murder."