Well, i think if martina can have some good performances at the end of this year....maybe like QF at Filderstadt and Zurich, SF at Linz, QF at Chase, stuff like that....then she will gain some pts atleast which will help her.
Also, martina always does well in Sydney, and with the extra 2 months to prepare she should be a lot fitter...so a SF of both Sydney and even Aus Open isn't out of the question i think - ofcourse depending on her draw.
After Tokyo, she really doesn't have many more points to defend. SF at Scottsdale, F Indian Wells, QF Miami and SF Hamburg....that's all
So she will realise that she is in a good position to gain points.