My friend abusive gf is about to meet me. The one person she can't abusive. Need advices

My best friend of two years started a new relationship a month ago.

• She moved in with him a week after meeting after saying her sob story.
• She forced him to get rid of all his female friends.
• He no longer practices the hobbies he likes like gaming and building computers.
• He's not allowed to play video games with women.
• She forced him to change his appearance like cutting his beard.
• I suspect financial abuse.
• We own a business together and she forced him to get rid of me, his best friend, and our future plans.

My friend didn't want to get rid of me but he did to make her happy. 4 days after he started dating her. For a month, we've been talking by email almost daily. I know he misses me. Email is the only communication form he's allowed with me. Blocked me on Facebook.

One night she messaged me and insulted me. Called me all sorts of names and lied about things my friend and I used to do.

Like "You wanna go on a business trip with him to have sex with him!" Or "You bought him beer to buy his feelings!" "He's not attracted to you!" "GO AWAY"

Same night my friend denied her lies. My friend asked us to get along. I reached out to her.

In the meantime, I stayed low and remained in contact with my friend. He kept things strictly business but would sometimes slip back into friends mode. I knew it meant he missed me as a friend.

I initiated a three way talk. Coffee, dinner, anything. To bring peace and explain to this girl she was lying. Hoping she'd understand and feel safe once we explain we're just friends.

Fast forward to yesterday. During the day my friend and I talked again about meeting. He said she wouldn't agree. I explained that she should if she cares about him and his needs.

She messaged me again with the same lies and blocked me. Stonewalling me.

Now see, I'm not the kind of person that does nothing with people lie about me. I used to be abused and now, I face things head on and don't let anyone spread lies about me.

So I asked my friend if he would explain to her that she's wrong, but he told me he wouldn't interfere. I understand why.

He was in another abusive relationship before, and he's been diagnosed with C-PTSD and depression. So I'll do it myself!

My friend gave me permission, as he thinks his gf crosses a line.

I wrote a response that I plan on dropping at my friends house and ask if we could talk.

Any advises to face her?