She was just going over to pick up a few things. Her ex had been trying to get her alone for weeks. After a small talk about "closure" she gave up and let him do what he's always done. Just one last time, he promised.
You tried to talk your sister out of going over to your bully's house. You don't want her to know that you kinda like the abuse now. Seems you're not the only one who gets off on being bullied.