Of course, it's friendship—there's no doubt about that. Grace looked at Katelynn, scarred and vulnerable, and felt a wave of pity. If it weren't for her, what would Katelynn's fate be? Would she die? Yes, she would. And Lieselotte? Would she die too? Yes, she would.
All of this isn't just coincidence; it's about the emotional connections we make. Maybe there were signs that led her to know V. He arrived in this past, at a castle that never appeared in her future. It's puzzling.
If they had embraced things earlier, Katelynn wouldn't have had to hide so fiercely. Maybe she could have found some comfort and people like her. The traits we're born with aren't up to us, but the relationships we form later are ours to choose. But right now, it feels like it's too late. She's grown up, no longer that confused young girl.