Dokic, for some reason, has shortened her backswing on her service motion.
Her inconsistency seems to show that she has not fully gotten used to this new technique.
But, since she was eliminated, she now has the time to practice on that serve.
I thought her serve was improved, and her 2nd serve was greatly improved. It's great to see her willing to make such a big change which will help her but not in the short run. Courageous move, Jelena. Keep working at it, and it will pay off for you as it did for Juju.