RE: Game retrieval problems
At six years old my guess is its too late..
You can try using a shock collar, but it will do more harm than good at this stage of her life..
She'll be scared to even jump in the cab with you..
Enjoy the years you have left with her, she probably loves doing what she does with you, and if and when you get a new pup use a shock collar from the beginng and it won't be long before it will not be needed at all....