[I would need to bring Mama to avoid getting Chelsaed myself. I'm not immune, I can just undo - half of it. And it was very hard to do, with Harley, it took longer than undoing Chelsea's work, she sank in deep. The fact that I could reverse it at all probably means that Mama could shield against her, but she must be stronger than any witch I'm aware of. Chelsea needed seeds to start with - she couldn't work from nothing. I'm sure Harley gave Chelsa nothing.]