Jeff, How is she with the water dish when it is outside of the cage? Is she possessive of the dish itself? Sorry to ask another question, but just trying to get to the root cause of the problem. If you can safely place your hand in the cage at other times, wouldn't that rule out "cage aggression." ANd if she is not possessive of the dish itself, would the only other alternative be that she is playing a game with you, as you suggested?