[null and void]

Yes, but comets do not follow strictly Newtonian orbits. Because bits that boil off through vents act like little random rocket engines, they are deflected out of perfect orbits. This makes their exact position unpredictable.

That being said, ISON is not likely to smack into Earth even under the most extreme deflection.

[Yosemitest]

I don[t remember her saying Ison would hit our World, so much as she suggested

there's a strong possibility that the debris trail (a cone shape) would affect us.

She also suggested that Ison might come around the Sun not in one piece, but shattered by the Sun's gravity, and highly radiated.
She also suggested that the outbound path (from the Sun) of Comet Ison might bring the debris tail into the Earth's path BEFORE we reach the debris trail left from Ison's inbound path.
So there's TWO chances we have for a prolonged attack on our World's surface from "Falling Stars".
And if Ison is shattered like the comet that struck Jupiter, then what?

But Ison just might crash into the Sun, and if there's a large amount of IRON inside Comet Ison, then how would that affect the Sun's solar activity?
Anyone who watches the Science channel knows that IRON is a killer of stars.