Extremely controlled. Very little emotion throughout the entire thing, which maybe has to do with her military background.
There was a moment when she said she was "very offended" by a comment about Russia but there was absolutely no emotion when the question was asked or when she answered.
The only time I saw actual emotion was when they asked about opening up information about government torture programs. She genuinely seemed caught off guard and surprised by it. It was so outside of her normal baseline it caught my attention immediately.
All that said, I don't know her pretty much at all. I'm much more partial to politicians who actually act like human beings (Vance, Bobby, Trump) even if I disagree with some takes.
They also all have giving an actual shit about the country and the people in it in common.
I don't get a similar immediate impression of that being the case from Tulsi, but this isn't necessarily the best avenue to gauge that aspect of her motivations and personality.