this week she is playing in Rome. No matter how she does, it will count towards her ranking. You can see here, which tournaments in the past 52 weeks she has played and how well she did:
Berlin 2008 will come off as Rome 2009 points are added, and as Vika doesn't play many tournaments a year, she doesn't have any back-up tournaments.
Next week is Madrid which is mandatory. Rome 2008 points will fall off as they get "too old".
BTW, Vika rank tracker from when she entered top20:
it took her 45 weeks to get from top20 to top10. I'm trying to compare that number to other players. So far I've only checked A. Radwanska. It only took her 18 weeks.