Back up your opinion with self-sufficient evidence and justification. It does not suffice to just point at what others have done.
Do you actually know what she was fired over? All I've seen in a statement that her employment was terminated.
For all I know the situation went like this:
SendGrid: We think you handled this situation badly, and since you were there as a SendGrid employee, that reflects badly on the company. We'd like you to make a public apology about they way in which you dealt with it. Adria: No SG: We're not asking Adria: But I'm not doing it SG: Then we don't think you can continue working here.
Which is to say, she may have been terminated because of how she handled the situation within SendGrid, rather than what she did at the Con. Or maybe not. I don't think we've been given enough information to know & nor are we ever likely to unless Adria posts it.
Edit: I've just read the more detailed blog post (http://blog.sendgrid.com/a-difficult-situation/) and it seems your interpretation is right.