R.T.
don't give it back. Maybe pick it up the frist time and give it back but tell her that if she drops it again you will keep it. Kids learn fast and 17 months is old enough to understand action and consequence. She'll probably learn pretty quickly that her game is over. Also, you could explain to her where she can put it (on the cart seat next to her, maybe) when she doesn't want to hold it... giving an alternative (and praising her when she uses it) might bring about some change. Good luck!