As far as the "why", 3 possible explanations come to mind. First (and most likely) is boredom. Boredom is the number 1 cause for destructive behavior in dogs.
Second, perhaps your pup isn't getting her chewing needs met. You might want to have more chew toys and bones around. Kibble is better than canned food for meeting this need and doing things to prolong their meals helps also. Things like toys that make them work to get to their food or simply scattering their kibble so that they have to hunt for it. These 2 things also help alleviate boredom.
Third, if you pup is isolated away from you when this behavior occurs, it may be that separation anxiety is becoming an issue.
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