How do I end this letter?

There is so much drama going on with my future sister in law right now

We paid $900+ in her bills so that they could keep a roof over their child’s head and food on the table and got upset with us that we weren’t going to buy her daughter a birthday gift in enough time for her to have it by her birthday party

We were going to buy it off of her registry and she threw a fit and said “well you can’t do that because it won’t come by her party and she will be so upset if she doesn’t have a present to open from you guys!!” And basically demanded that we buy her a gift from the store instead.

This morning my fiancé got a call from her and she was basically asking if I don’t want their families help with the wedding planning anymore because a job (that I didn’t even know she gave herself!!!) Was given to my sister and she felt hurt and unimportant because she was no longer in charge of that job.

My mom who has had ZERO involvement in the wedding also wanted to help put together the invitations and my future sister in law threw a fit about that and saying how I keep taking away all the jobs I’ve given her (I’ve given her ZERO jobs!!!) and not to mention, I planned on having the entire wedding party be apart of the invitations but instead of asking for clarification, she called up my fiancé trying to make me sound like an awful person and started crying when he basically told her he didn’t give a shit that she was upset

This is a letter I’m working on currently…. I need help with the closing statement because right now I just kind of feel numb 😭