Let's do the math: She was a First officer for 7 years. We can safely assume she had at least several years in Starfleet preceding her stint as FO. I can't imagine someone would go from Starfleet cadet to FO in only 3 years, but let's be generous and give her that. That means she's been in Starfleet for at least a decade. But we're supposed to accept that all of her training and discipline is suddenly forgotten and she is now nothing more than a thuggish, cornered animal? M'kay.
Yeah, and why the fight? I thought she was all Vulcanized an sheeyat. So, Logic got tossed out the airlock and traded for brawls and giving the Captain a Vulcan neck pinch? This weird Kurtzman dude is determined to make Vulcans a violent species.