Need help, Letter to MIL

So long story short I had to cut my mil off from myself as well as my son. I won’t go into to much detail but I will say she attacked and threatened me and my life. So for obvious reasons I don’t trust her nor do I trust her near our son. She will be flying into the country for her youngest daughters high school graduation in which case I do t want her anyone near me and my son, especially since she hasn’t apologized. She sent me this email the other day...

I blurred out our names for privacy, but this has pissed, cause she’s been telling him for months now that she was going to write me a letter apologizing...this is what I got. I showed my husband what I was going to send to her but apparently it was to hurtful and mean, and I should revise it. Which I personally think is bullshit, but I’m willing to consider it for my husband. However my husband said if I send what I wrote that she’s gonna go off the handles and and attack me again, and say similar things.. which she would be straight up lying, since I’ve only met her once, and the very few times I’ve talked to her I have been extremely nice and courteous to her.

This is what I wrote..

Yes. I found what you said to be very disgusting, vindictive, and manipulative. I feel that you were taking advantage of (husband) at one of his weakest moments, in which you tried black mailing me about something I confided in you for. We have an open phone policy in our relationship, something you didn’t know about. When I went you you never gave me advice but told me to lie and keep it a secret from (husband). I told (husband) the next day, something you didn’t know and tried using against me. The things you said about me and what to do to me were horrific and disgusting to hear, especially from a mother about her daughter in law. It has made me lose all trust in you. To me the fact it was so easy for you to say those things about me makes me fear for not only myself, but (our son) as well, In which case it makes me not trust you being around (our son).

Do you think this needs to be nicer considering she attacked and threatened me and my life? Should I revise it? Add anything to it?