Good Luck, the bitter orange sounds like a good idea.. No matter how hard I try Gizzie always finds a way to get into something its not your fault they are just so sneaky 

  My suggestion would be use the bitter orange and provide things she would love to chew on instead like the bully sticks or pig ears and eventually she will learn, Yummy treat or yucky cord, she'll get the hang of it
 
 
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  and in the end, its not the years in your life that count but the life in your years.... Abraham Lincoln