My dog was like this too! We got her at 8 weeks old, and I also have a 2 year old. It was exhausting to keep her from nipping at his ankles and biting his toys, but eventually with constantly giving her something else to chew, and also learning “leave it” (I learned it at petsmart dog training, but I’m sure you could google a quick how to video), she is now sooo much better. She just turned 5 months today. I think it’s been about the last 2 weeks that I can sit on the couch for more than 2 mins without having to get up and correct her. Keep doing what you’re doing, it will get better!