There's a difference in playing net in singles and playing net in doubles. The movement is different, the positioning is different, and the set-up is different (more reflex than in total control).
Anyway, Kim can certainly improve. I think she could easily improve the placement of her serves. She can hit all corners of the serve box, but she tends to go out wide (on both sides) the majority of the time.
In terms of strategy, I think Kim could be offensive more of the time. While she is offensive against lower-ranked players, she become more defensive against top players. It works to get deep into a 3rd set, but as someone else said, Kim needs to stay aggressive on the big points.
I don't really see Kim changing too much at this point. Obviously she can make subtle changes in her game...but I can't think of many players who completely revamped their game once they were already in the top 10.
Prayed through the nights
felt so alone
suffered from alienation
carried the weight on my own
Had to be strong
so I believed
and now I know I've succeeded
in finding the place I conceived