In her mind, she probably sincerely believes she is in the right and those were saintly words.
I think you can drop the "probably." Liberals rank among the most self-righteous people on the planet. You can be that she DOES think she is right, DOES regard herself as saintly.
Her hatred of conservatives, rejoicing in their deaths, is not a whole lot different than the attitude of radical, self-righteous Muslims. That attitude that they have in common is why the liberals practically adore Muslims (generally overlooking the fact that the jiahdists want to
kill them, too).