Now that she's lost a lot of her leaves, I can see that the red isn't in fact coming from the leaves at all. It's the fruit!
Here's how the fruit looked on a low branch five days ago. (The lower branches are changing a little more slowly, so I'd say this part of the tree is behind.)
And here's how the fruit looks today.
Hmmm... hard to tell.
The fruit hanging midway up the tree definitely looks darker than this fruit though. (The middle section of the tree colored earlier and has lost the most leaves. I'd say this part of the tree is ahead.)
Still, who would have thought that the seeds would be responsible for the fall colors and not just the leaves?!