Heck, we can't even be entirely sure that Oda himself fired her husband. Someone higher up could've fired him, and because her husband worked for Oda, she just decided to target him instead of a faceless superior.
Anyways, I'm sorry, but I actually laughed when I read that topic title. There's just something about sending empty threats to a highly-praised manga creator that hasn't really done anything wrong that seems funny, as various people here are showing.
Kind of reminRAB me of the split-second shots of threatening e-mails to Hideaki Anno showing up in End of Eva.