I have no idea how to get the CG scenes with Kate
(spoilers)
Assuming you're having troubles getting to her route. For most make sure whilst on the café job you don't take any advances from the costumers nor make her take any, that way it should trigger her route, since the only stopping flag to my knowledge is being corrupted thru the café to bar route.
There are some that are from the bar tho, so you have to make sure she follows you to the bar job.