If person B had been a stranger to CL, why should B have offered to do such a job? Why should have CL trust a stranger (B), who knocks on her door and warns her of a severe threat?
Which threat could it have been: abduction? murder?
Why should person A have known of a dangerous threat? The perps wouldn't have talked about something really bad in his presence, one can assume. If person A belongs to the inner circle, why would he have wanted to warn CL?
I'm trying to brainstorm, nothing more.

ETA: If someone wanted to warn her and he was able somehow, one could imagine, that CL in a flash disappeared of her own and since is indeed living her new life abroad somewhere.
IMO+MOO