It’s not pure luck though. In any race you get a set of variables that a horse has to overcome. You take form on the one hand (I don’t deny she is the form horse) and available odds on the other (and analyse likely value) and imagine a plausible outcome in relation of one to the other.
Now while I like BC’s form I don’t consider it to be good enough to necessarily overcome the variables of the race: size of field, draw, improving opposition, trip to a course she has not set foot on in a different hemisphere, etc.
Consequently value is likely to be there amongst double-digit odds, whether you are betting each-way or place against an odds-on favourite that is far from a certain winner and one of the worst value bets I’ve seen.
It will not be luck that beats her. It will be a range of variables and dynamics that make up a horse race, as well as the one or two that get to the finishing line first.
Good luck if you're going in for her I'm not nearly brave enough.