Loki is the God of Lame and Chaos. That's fine. She recognizes that. That does not mean she has the Chaos Domain, or that she herself is Chaotic.
Still, the fact that she refers to him as such, rather than, say, the god of Trickery and Evil, is suggestive: It says that she considers Flame and Chaos to be the two most important aspects of Loki's sphere. This is especially so considering that we know that Fire is one of her domains. Barring any evidence to the contrary, I'd say that's strong enough evidence that she has the Chaos domain.