How long after her meal is she regurgitating?
If its right after the meal, its probably something like eating too fast, or possibly she has been hungry for a while, had a build up of stomach acid, and when something hits the stomach, she pukes it up. My boy does that sometimes and used to puke straight bile when he'd be hungry because he was bad about eating his food (another dog and a different food has helped with that). But once in while, he'll puke right after the meal because of the build up of acid.
If the dog is puking whole kibble HOURS after the meal, it does point to mega-e. The kibble should be getting digested and the only way it doesn't is that its stuck in the esophagus.