Friendships ending

I just need advice from a bride that has possibly been in my shoes. I decided to end a 14 year friendship with one of my bridesmaids. We had been growing apart for some time but I was badly trying to hang on to the friendship. She is not in a good place in life and has not been for a while. I felt like she changed once I got engaged, almost as if she couldn’t be happy for me because of her own misery. So we ended our friendship, drama free. However, she went to my other friends and stirred the pot. It ended with she said you said you said, gossip, and drama. All this took place behind my back. Last weekend they tricked me into believing they set up a beach day for me and it turned into an ambush and they even recorded the whole thing. Obviously these girls were never my friend and I understand that. One of them was an addict and did a lot shady things to be in the past but since she got clean I forgave her and we moved on. It seems pretty simple, move on, these weren’t friends, but I’m having a hard time just being happy and excited now. How do I not let this get to me? How will I be feeling the day of my wedding ? I have tone of support and a big circle of friends and family, but just never expected this from those closest to me.