I think you're missing the larger point. It's mostly the large companies and those in power that create these rules. I'm not siding with either side here, but simply saying that "the rules are the rules" is not enough if the rules themselves are wrong.
If we want to make it harder for unions to organize, then she was rightly fired. But ff she was fired for union organizing and we want to protect that activity, then she was wrongfully fired.
I don't disagree, but you're talking about right/wrong from a moral standpoint, one that many people probably agree with, but it's not an absolute.
The right and wrong I was talking about was with respect to the existing rules, policies, and ethics. And if you do believe these rules are morally wrong, then you change them from within the system.
The upside is there are multiple opportunities to do this without also getting fired. There are also opportunities to do as much union organizing as you like without getting fired. The Thanksgiving four played a very dangerous game, as did this individual, and they got the expected result.
Unfortunately, the other result is that if you want to find examples of blatantly illegal union busting, I'm sure they are out there but these are not them. This smacks of agitation and activism for it's own sake.
If we want to make it harder for unions to organize, then she was rightly fired. But ff she was fired for union organizing and we want to protect that activity, then she was wrongfully fired.