If she has been fired because they're being DDoSed, that's a miserable precedent for anyone who works at a tech company.
I totally agree. It feels like a sort of toxic leakage of what should be safely contained in disreputable corners of the internet.
Granted you're just saying that _if_ it's because of the DDOS this is inappropriate. I'd agree, but I doubt that's the reason, unless it is just what happened to draw their attention to this.
For what it's worth, I think 'evangelist' is a stupid title and 'advocate' is better. Yeah, 'evangelist' sounds cooler, but evangelists get in your face about unprovable stuff and harass you until you comply - not something you want to evoke in your job title. The standard joke about door-to-door evangelists is that you shut the door in their face.
So what you say is possible, and a panicked company might throw an employee overboard, but at the moment (11:13am pt) I still wouldn't rule out account-compromise-and-hoax.
The sentiment around places where "DDOSers" might hang out is pretty heavily against her. Remember, a programmer got fired for a harmless joke, at a programming conference, thanks to an over-zealous "evangelist".
This whole situation is ludicrous.
Switching to Mailgun (for high value stuff) or Amazon SES (for low value/cheap) is pretty easy.