"I'm fairly certain no one knows what's really coming." Was there even any way to see it? Charge up something with too much power, sure. Anything could be possible. But when someone thought about anything, did they think it could involve the ability to pull things across miles and dimensions and worlds? Somehow that seemed too out there even for the most practiced in the supernatural and specifically Druid magic. Cora knew of the Durach. Going crazy with darkness and power made a hell lot more sense than whatever was happening now. It was about context and scope, really.
While Cora had always tried to prove herself, to show she could keep up with Derek and Laura when she was younger, and then just to survive, the desire for power like that made no sense to her. To control others. But that was Cora and Peter was Peter, who killed Laura just to get Derek's attention and become the Alpha to avenge the fire. They all had done things that were questionable, but that? And for what? Fleeting 'power'? It didn't make sense.
Truthfully, the one thing Cora wanted most seemed to be the one thing she wouldn't get until the past stayed in the past. And that was to finally stop running. To stop being on the move all the time and have something stable. Well the Nemeton wasn't letting her run but she wasn't certain that was a good thing at this point.
No comment was needed on Peter not being a proponent of self-sacrifice. All she did was shoot him a look because she knew that one far too well. The family was even more splintered because of his actions. Yes, Cora had thought Laura dead since the fire, had mourned her but to find out that she was dead but because of the Uncle she had always trusted hurt. A lot. And it made it hard to trust anything in this place. She did agree with his assessment, though. The Nemeton having too much power because of the self-sacrifice the three had done. She didn't know the specifics on if this would have been the result of who died in the sacrifice and now it didn't matter.