Mocking personality?
She'll say something negative or hurtful then goes into a derisive chuckle, as if she's laughing at your distress. She does this a good bit, laughs as if she's laughing at you or the painful parts of your situation. It's infuriating when you listen back. She also uses contemptuous language and talks to you as if you're very weak, e.g., in a mocking tone, "Oooooh, you'll just fall back in his arms." It makes you want to punch her. She did this to my friend too so I know it wasn't just me.