the other thing you can do is get the cat into a crate / cage, put your dog on lead, take her to the crate and teach her leave it.
you say leave it, leave it, leave it etc until she looks away, you click then reward.
once she is good at that then try the leave it command when the cat is out just laying around then you try the leave it when the cats are running.
"In order to really enjoy a dog, one doesn't merely try to train him to be semihuman. The point of it is to open oneself to the possibility of becoming partly a dog." - Edward Hoagland