i think my cat has all timers  

Also, it's called Alzheimer's, not all timers.

That is very funny, but maybe if it's just everytime you walk into the kitchen, she's just become OCD and HAs to eat everytime she sees someone walk into the kitchen because it's a habit for her to do that. Either way, as long as she isn't gaining weight I think that you have nothing to worry about.

If she is eating and drinking a lot and is losing weight she could have diabetes. So keep a watch on her if her eating habits have changed.

does she have bad breath? A dental abcess causes a lot of pain while eating and leads to sporatic eating habbits. Bad breath and changes in eating are the first signs of an oral abcess and dental disease.

Some cats are nibblers. My two act the same way. They grab a mouthful and leave the kitchen. I don't think your cat is forgetful, it's just her way.