moh plus 1?

My MOH is my very best friend. I've known her since grade school. She's currently 'dating' someone almost 30 years older than us (we're in our late 20s). I use the word 'dating' because even she's told me they're not really together, but more like business partners (he's in NJ, she's in SC, and he paid for her condo - his daughter goes to college a few hours from where my bff lives). I've already told her that guy is NOT invited to the wedding. He's belligerent, rude, aggressive and clashes heavily with my FH's family (he used to live in the same neighbor as my FH). She totally understood and agreed. NOW the question is, do I still give her a plus 1 to bring some random person or just invite her solo? I don't really want her bringing a random person. I love her to death, but I just don't like her taste in men. We're nowhere near close to sending out invites, but we're having an intimate wedding and trying to lock down our guest list.