Q. Why after Jess has eaten her breakfast or tea does she be sick straight after. Could it be that she eats it to fast ?
A. Yes, eating too fast is a possibility. Try putting a few large glass pebbles or marbles, too big for her to swallow, in her dish with her kibble. This should slow her down. Or you can find a puzzle feeding dish (search for them on Amazon) and feed her that way. This dish holds the food in such a way that your cat has to use her paws to tease it out, slowing her down and providing some mental stimulation at the same time.