Well, it makes a huge difference in her draw.
Seeded 8, she would face someone ranked lower than her in the round of 16: Mauresmo (who she beats often), Farina (please), Hantuchova (still streaky), or Shaughnessy/Dementieva (please).
Seeded 9, she'd play Hingis (need I remind you of that record), Henin (umm), Seles (umm), or Dokic (umm).
And also, she'd play a 25-32 seed in the round of 32, instead of a 17-24 seed. It really doesn't make a huge difference in that part.
But let's say she makes the round of 16...wouldn't you rather have her play Farina or Shaughnessy than Henin, Seles, or Hingis for a spot in the quarters??