All of the sudden Naughty!

My female, Reagan, will be one on the 13th. We recently lost a puppy (hung herself on chainlink) and I don't know if it's connected be the very next day after if happened, Reagan all of the sudden became very destructive and doesn't mind. She chews up everything now and I've even caught her ON THE TABLE! Reagan prior to all of this was very well-behaved and even as a puppy never destructive. Now she's always getting into trouble. She gets plenty of excercise, she pulls a sled 3-4 times a week for atleast an hour and when she doesn't sled, she goes for a 3 mile walk. I give her plenty of attention, I take her everywhere so please what should I do to get her to stop! Could she be acting out because of what happened to the puppy-she saw it happen. I knoq Cesar Milan would say no, but it seems like a strange coincidence.

I always hear people say that dogs don't have those kinds of emotions, or are able to connect what happened or whatever.....BUT I think they can and do. I can't help with the situation but good luck.