How to recognize Negative coworker in the C-Line

We know that the C-line should be accurate using facts that others would agree with (as opposed to our thought coloring/opinions). I’m wrestling with a person who expresses more negativity than neutral or positive remarks. While I am certain that many others in the office would state that she speaks often with negativity, I can’t help but think that qualifying what she focuses on with her verbal remarks is still a thought.

With this suspicion, I’m struggling to use a non-descriptive C-line that “She speaks”.

-cubemate to Negative Nelly