Feed her less, or leave less food out. Our stupider cats have done that, just overeating to the point of nausea.

XD Our brother's old cat did the same thing. He'd keep begging for food, whether he was hungry or not, eat to a certain point, stop, stagger to the corner, puke, and stagger back to his dish for more. They just stopped giving him stuff after a while. Silly bulemic kitties...