My wife and I took in a four year old GSD approx. two months ago.  It is clear that the woman we got Kaia from only used her from breeding.  When we obtained Kaia, she would not sit, lay down, stay, or recall.  I have been working with her and have been having great success, except when she has a ball.  This is when she is stubborn and does not want to recall.  I think I will be able to fix this with the help of an e-collar.