Future daughter in law drama

This is long, my son’s getting married next week, I had offered to pay for half of my son’s wedding so that his fiancée and he could have the type of wedding that they wanted and I welcomed her to the family. I tried to be a support person for the bride since her family is very dysfunctional and there has been ongoing dissension since my son started to date her. She had asks me to assist with the decorations fo the wedding, center pieces ect. but would constantly change her mind about what she wanted after I would made the purchases, after this occurred 4-5 times, I told them both that they needed to find someone else to help since all the back and forth was stressing me, well we had a blow out and she became bridezilla and we stopped speaking. She hired a wedding planner that did not work out and brought her aunt on board and asked me to work with the aunt to plan the wedding and she half heartedly apologized for her behavior, I told her that I would only do what I was asked to do and I would not give any advice, opinions or suggestion and I kept that promise The future daughter in law then offended the aunt and rejected everything the aunt was doing for the wedding so they stopped speaking, I became the peacemaker and got everyone back on board. Well the past Saturday we made the final payment and 2 days later she became bridezilla again. Monday we were suppose to go to the reception site for a mock setup since she has Ben very picky about the way she wants things done, she waited until 30 minutes before we were due at the site to see if she could catch a ride with me, I let her know that I was loading up the car and it should be ok, I called back when I found that there was no where for her to sit due to all the supplies that were needed, she said she wasn’t going and hung up on me, I called back to apologize offered to try to stack more item and let her hold some, she hung up on me I started over her house and would not answer the phone. I met the aunt at the reception site and we made decisions for the bride and took pictures, to make a long story shorter, we had another blow out which was major and involved her telling not to mention only other daughter in laws name, yelling at me being, disrespectful, having attitude and telling me what I needed to do and tried to tell me what my problem was before I hung up on her, I did tell her that we should agree to disagree she need never to speak to me in the future except at the wedding if she chooses, this is not the first time she has done this to me and she has spoken to me in ways I have never allow any family member to speak to me. Now my son will not come to my home to pick up things he had delivered here and will not talk to me, I am heart broken and don’t know what to do, yet she is still texting me things that she wants me to do, I feel like this issue with the bide is not fixable before the wedding and my relationship with my son is ruined.