The last reply is absolutly correct, it is a soothing techinque they do for themselves. Its like people who smoke, chew their nails, or drink wine to unwind after work. Nothing wrong with it, just learn to manage it and giver her plenty of chewing choices. Hard stuff, those puny lil toys they have wont work.
Go for........
- Nylabones, not the compressed ones cause she will go through it to fast and even make herselsf sick
-Doggie tires toys that are safe if ingested
And my number one savior for Rory........Cow Hoofs, they last so long, the dogs love them, and you can fill them with stuff, plus they are cheap and last a couple of days!