That’s what puppies do at that age. Maybe give her chew toys or bones so she knows that it’s ok to chew on certain things and if she gets mouthy with say your hands, tell her “no!” Firmly.
Give any edible when your home, they can choke easily on any edible. Just my opinion of course. As a puppy I wouldn't give any cardboard boxes.
I used to give my dog cardboard boxes. He ripped that up in no time and then I would throw it out. Alex is right though, bones or Greenies.
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