Thanks. She was terminated for poor performance. She went home, got angry, and started sending us emails threatening a lawsuit (because she'd hired an attorney, and we knew about it before terminating her.) She felt her performance wasn't that bad. As far as I know, she is not legal to work in this country at this time. She originally had this right, but when it came time for renewal, she was unable to renew. That's why she and her husband hired an attorney, which gave her the right to work for us pending an appeal. By the way, she was a young woman.
On the advice of our attorney, we sent her 1 letter (not email) in response to her rash of angry and threatening emails to us saying again that she was terminated for poor performance. (She was angry because she said we didn't tell her about the mistakes she was ultimately fired for, which is true because they were found a month and more afterward - and had affected our financial picture.) We didn't go into detail. Though it was sudden for her, it really wasn't. She had been told of previous mistakes she'd made, her reviews were not great, but apparently it didn't sink in that her performance had to improve.
The severance pay idea came up because her supervisor, our comptroller, felt badly for her because she had paid for an attorney. We did decide that severance wasn't appropriate though. (We don't have a severance policy, but have paid it for layoffs with a required signed release. It hasn't happened very often.)
This person had an "entitled" attitude to the extreme. She was an HR nightmare, though I tried very hard to work with her. Maybe it's not because she was from Canada, but she kept comparing the US (bad) to Canada (good), and it really made me wonder if all Canadians have "entitlement" issues.