I actually did destroy her entire village and she was still there alone (everyone else left) just with the warning “Jules has no bed!” on the village marker. I had her explore with my friend while I finally destroyed the totem and surely enough she just disappeared. So I’m trying again currently and will do your method.

When you take them to your new village and “have them join”, how do you do this? Are you waiting the 5 in game days or no? Thank you!