AITA for not inviting my ex-friend to a party?

Hi, I’m 19(F) and me and my friend 20(F) are throwing a huge party at my house within the next few months. The party is well over 50 people. When deciding who to invite my friend 20(F) - we will call her Amelia offered to invite her cousin who we will call Junia (17) Me and Junia are NOT friends. We used to be friends until there was a fight that broke out a few years ago. We were still mutuals on social media and then she got with my ex and unfollowed me and publicly makes fun of me with her friends in front of me. I immediately vetoed that. Amelia agreed it was a good use of a veto but we both are afraid she will find out and cut her off or get into family drama if we don’t invite her. Family is a tough thing and I would normally be okay with inviting her but I don’t want to be disrespected in my own home. AITA?