How do you break up with a friend

Long long story short I was “friends” with my ex sister in law (her brother and I were married for 11 years and now divorced for 4) She is a lot of drama her and her new w ex moved down the road from me and my new husband and we occasionally played cards or had dinner with them (my husband does not really like her) but now her and her now ex had a falling out (think major drama) and she kicked him out she has a new boyfriend and has now moved. She keeps texting me to hangout but honestly I don’t really want to hang out with her I would love to be free from my ex and his family and be able to enjoy my new husband and our new family and have a stress/drama free rest of my pregnancy. How do you tell someone you don’t want to be around them anymore.....