I agree with most of what you said.
I have seen Jarka play on TV a couple of times, once at Wimbledon last year (against Jankovic) and also this year at the Australian Open (against Serena Williams).
Whilst it is probably unfair to judge her against such quality opponents, there were still things that can definitely be looked at and improved upon.
I agree that her serve is (or should) be a weapon, but her second serve seems to be quite a confidence shot. She needs to develop more spin on the ball and get a bit more accurate with it. I also agree that her groundstrokes are solid and effective, but she really needs to put more topspin on the ball, especially when draw deep or wide...
But really the biggest thing that needs to be worked on is her fitness and her movement...she was quite solid at the Australian Open, but seems to have lost some weight since then, which is a good thing. She needs to make a Casey-like transition. Once she does, she should be top 100 again
And I definitely agree that she needs one coach to work with full time - Dellacqua is working with Nicole Pratt and Stosur and Molik both achieved thier best results with an individual coach. Jarka is no excepting. Working in a group like situation may be beneficial for some things, but not for many others...
Thanks for the reports