My bet is that it won't happen, if only for the simple reason that Veronica is far more important to the plot than Juliette herself. Too much of everything is tied to a living Veronica, from the scientific developments without which the company cannot exist, to enforcing the terms of the Gambit, to the survival of the continent and the entire planet, which no one but Vi can ensure.
So it's only natural that a character like Veronica should have impenetrable plot armour, at least until the finale, when the struggle for power over the world enters its final bloody stage, where any of the Karlsson's could become a victim.