Why God doesn't stop satan?

[R00tKiT]

P1, as you've stated is that she is going to choose F at some later point.  I don't care what you call them, at that point--prior to her choice--it's possible that she could choose flavor G (or any other flavor than F).  But if it's possibly true that she chooses G (or any other flavor than F), then P2/P3 are possibly false--which they can't be.  

No, miss. You're literally attempting a strawman now. My argument doesn't rest upon the premise of possibly choosing F or G, but on effectively choosing F, not G, thanks to free will. These assertions aren't the same. So your objection above, while true, is irrelevant to my argument.

So no, if P1 is true (as I initially formulated it), then it's not possible that D chooses G, because she already chose F at the particular moment when P1 took place.

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Is there ever a point where she could have chosen G?

Of course there is, that is before she chose F, duh..