She couldn't help it, the second Christy opened the door, and Billie was absolutely positive it was in fact her sister, she took a step toward her and pulled her into a hug, doing her best not to try. She had been absolutely devastate when Christy had died in front of her. It had been her own doing, to a point, but it had possibly been the worst thing had had ever happened to her.
But not wanting to seem like too much of a cry baby, she pulled away shortly after, rubbing her hands under her eyes to wipe away tears in her eyes. This was twice her sister had come back from the dead, in a way, she could only hope it stayed that way this time, and hopefully she could convince Christy that the Triad had only wanted to use them both.
"You have no idea how happy I am to see you." she said laughing slightly, probably looking like an idiot. She didn't know if she was in danger or not, and to be honest, she didn't really care. Billie knew she was going to have to talk to Piper and Paige after, or at least Paige, since the Piper here never went up against Christy. But surly she could make things different. They were in a different world, the Triad wasn't here, there was no one for Christy to take 'orders' from, maybe she would listen once she knew what happened. "Did you want to get out of here or just stay in? It's not exactly safe out there these days, but I think between the two of us we can handle whatever comes our way." she said with a smile. They were an good team, they had even been equal against the Charmed ones. The two of them kicked some serious ass, but it all depended on whose side each sister was on.