M2Mom, thank you once again for the wealth of information you provide. I have read up on cockatoos so much (sometimes I think too much) and something I read stuck in my mind - that there was a limited "window of opportunity" soon after taking a bird home where one was to set a pattern for the future, etc. It helped to be reminded that she is just a baby and in need of love, reassurance, and bonding before training.
And Linda, the info on the diaphragm makes sense now. Thank you guys for sharing wisdom - I'm sure Gracie is even more grateful! ;-)