No-no-no, look what happening (soft murder path):
1) First meeting with Kate, we are nice with her, help her with maths, look to her cleavage (or touch her ass, is there any differences?);
2) Mrs.Ginger is shooting in museum, Kate ask to comfort her, we do, then free her with ring;
3) We have Gina's necklace and Pamela's braslet in inventory, and know Allison's Chant for protection. When we talk with Kate in the park, we ask her about Davy first, then free her with ring. She is angry again, and there are two possible choises: "Wait, I want protect you" and "Wait, I love you", but there are'nt any diffrenses between them, because Kate ran away in any case, and we can't give her necklace for protection from Davy.
Yes, we can charm her later (in her room, after confrontation with Davy, if we are invisible, when she want to leave the town), but can't be with her without "cheating" with charm.
Love route with her is closed?