I think there will definitely be an upswing in sales within the next few weeks, b/c of the holiday shopping and her touring the radio station X-mas tours, which will give her exposure to a larger audience. Good music, gets around!
I'm pretty sure that is what A&M was hoping when they pushed the date back to early November... but you also have to factor in all of the older CD's which get bumped up in sales during the holiday shopping rush, too. I think that has to factor in to Vanessa's poor sales this week, and will probably continue to factor into the sales in the near future.
As for the radio shows, frankly, she could be hitting a bunch more (that she really should be) that she isn't, which doesn't bode well for sales in that the same artists she is hitting the few radio dates she is doing with, are also doing some of these other dates, which means more sales for them, less for her.