No, she "belted {the Klingon} across the face with her sword's plain steel-disc pommel"--that describes neither the Heart nor the Thorn of the Rose.

My guess is that she's wearing a standard-issue officer's weapon, and that at some point she's (consciously or not) picked up on the Blade of the Inviolate Soul technique while training with Gryphon or Kate.

Using that, she could probably parry a lightsaber with a broom-handle... :)