You will need to ask Russell what she means. But it is my guess that she is speaking of the arena of play. God can and does decree in a arena of play as was seen on that long list of verses given by ben.
I'm not sure what you mean by "arena of play". I was speaking about God knowing things like the fact that if the miracles done in Chorizin and Bethsaida had been done in Tyre and Sidon, the people of Tyre and Sidon would have repented. He knew it, but he didn't know it because he decreed it, since he didn't decree it. He doesn't know it by foresight, either, since it isn't a future event.
However, what makes everything that happens absolutely certain to occur is the immutability of God's counsel, or his unchangeable purpose or decree. So I do think we can say that God's foresight of future events is based in his decree.