Yes or No for PODD use

It would be really helpful if Grace had an understandable Yes and No for her use with PODD. She is good at using her "please" sign as YES. She pats her chest for YES pretty regularly. We are on the edge of getting a regular "no" by Grace touching the side of her nose.She can say "no" in context of reading a certain book and with a repetitive game of saying "no" but we are trying to generalize it so that Grace can learn to say, "no" especially in response to a given item or suggestion. This video shows a practice of getting Grace to say, "yes" for the bubbles, not just reach for them and PODD use.