a romantic comedy about the rivalry between a jealous ghost and a flaky psychic for the love of a veterinarian — “Over Her Dead Body” is not bad. Eva Longoria Parker, as Kate, the ghost, represents the control-freak/ice-queen end of the female comedic spectrum pretty well, while Lake Bell as Ashley, the psychic, is perfectly lovely on the sweet, scatterbrained end. In the middle is Henry the vet, played by the winningly smirky Paul Rudd, and there are sidekicks drawn from the usual storeroom: the kooky sister (Lindsay Sloane) and the male best friend (Jason Biggs). There is no question that this movie, the first feature directed by Jeff Lowell, whose screenwriting credits include “John Tucker Must Die,” could be much worse. But it also could have been, with a little more effort, a lot better.