Definitely take this part out. Do not tell her how "hurt" you feel. Tell her you do not appreciate being disrespected in front of your children. Take the position of power. Say things like, I do not appreciate, or it is disrespectful of you, things like that.
Keep the emotions out of it. Don't sink to her level.
When she called to talk, you shouldn't have even mentioned that she could email. Do not acknowledge her at all. Let her sweat it out. These are the results of her actions. Even after all this, you still give her too much respect in responding.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.