Inviting most of my cousins...except for one.

So we're getting our guest list together and close to our goal of 80 total. We're inviting close family and friends which includes some aunts, uncles, and cousins however not all are going to be invited (already spoke to them and they're more than understanding, doing a backyard reunion to make up for it). My uncles and cousins on my dad's side are all invited as I'm very close with all of them and it's not a ton of people. One cousin however is a rather difficult person. Her brother will be invited but she has done some quite shady things. Called me every name in the book for not going to her wedding (even after explaining I was in college and had finals, nor could I afford to go out of state of it) she also tried fooling around with my mom's ex husband (step dad) while they were still together. She's overall really not well liked in my family, even by her brother. But I feel guilty for inviting her dad, her brother, but not her. Should I include her on the guest list? She likely wouldn't even come, but I don't want to cause drama by specifically not inviting her.