Frustration

I have never been the type of person who willingly threatens physical violence when upset, but lately I have just really been wanting to kick the shit out of my husband's ex-wife. She is truly truly crazy, and her craziness is making me crazy. She has made several attempts to ruin my relationship with my husband, and everytime she does, she just reinforces my belief that she should not be a parent, and that her death would make me ecstatic. She accuses my husband of cheating on me with her, she comes to my house and tries to act friendly and then she goes all nuts telling me that my marriage is over, then when I try to work things to better it for all of us, she goes nuts on the phone, and accuses me of harrassment.
I wish I could send her this letter
Dear Holly-
It is not harrassment when I call you to schedule a time to meet to give money to you for child support, but it is harrassment when you call my cell phone repeatedly blocking your number, wanting to speak to me. It is not harrassment for me to request that you call me instead of the husband in order to discuss a proper payment plan for bills, but it is harrassment to ring my doorbell thirty times in order for me to let you into my home. Also, no- I am not a part of your life, but I am a part of your sons' life. You might want to check yourself. I have been nothing but polite and civil to you. I have never threatened you. I have never demeaned you in anyway in front of your child, and you should be happy about that. I act like a grownup- you act younger than your toddler. So what? I took your toy away, its been over a year- GET OVER IT. You really don't want to get me mad. I have more connections in this state in higher places that you will never know about. I can get custody taken away from you in the blink of an eye. I don't want to. I would rather just live in some kind of harmonious civility. But, Holly, I will. I can make your life hell, and if you keep pushing it- I will.
Alas- I cannot. I am too devoted to my stepson and my husband to call her out. I am sure that if I did, she would just take us back to court and it would be neverending, and I can't have that happen to C. I lived my life with my parents bickering, and I hope that she gets the picture before she ruins his childhood.