Bridesmaid inviting teenage kids to bachelorette… Wwyd?

I just got done talking to one of my bridesmaids (my cousin) and we were talking about how I was thinking of going to universal/Harry Potter world for my bachelorette. During the conversation she mentioned in passing that she’s currently looking for hotel rooms and is booking for 3 people: herself and her two teenage boys. And she also said they’d be so mad if she went without them. I was in shock cuz I didn’t know how to respond to her. AITA for thinking this is completely absurd that she would even think it’s okay to be bringing them with her for a Bachelorette party? My other bridesmaids I’ve talked to have already planned to leave their kids at home and I thought this would just be a no brainer that of course no kids, let alone teenage boys, would be invited….
What would you guys do in my situation? I’d like to add that I’m not a very confrontational person and she is 100% assertive. Help? 😬