Never yell at a dog for doing something wrong. They don't see it as being bad and yelling creates insecurities that can amount to much worse conditions. When a dog begins to chew things, it's one of three things:
- Poor early social skills; she wasn't taught at a young age not to chew things.
- Separation anxiety; she never learned to be independent and now has a rough time coping on her own.
- Lack of exercise; she is bored, frustrated, and has energy to vent.
Based on what you have told us, my guess would be she isn't getting enough exercise. Dogs should be taken for a one hour walk and a 30 minute high-cardio play session every day. When you neglect their exercise, many times the dog will become destructive. A 2 year old with a lot of energy should have even more exercise. Along with physical exercise, dogs need mental exercise as well. You can purchase some interactive dog toys or you can train her. Training your dog commands will raise her confidence and release some tension, as well as helping you bond with her. Start with "sit" "stay" and "come - do an internet search for how to teach these simple commands.
If she is a coonhound, you may want to try retrieval games using a plush toy with a dab of duck scent (you can get duck scent from an army surplus). Start by holding the toy in front of her and giving her a treat when she touches her nose to it while saying "retrieve". Practice until she learns the command, then refuse to treat her until she mouths it. By gently bumping her nose with the toy, you can encourage her to put her mouth on it. Then you say "retrieve" and give her the treat and praise. After teaching this, hide the toy in an obvious place while she watches. Ask her to retrieve and give her a treat for doing it. Soon you can start hiding it without her watching, but keep it simple at first. When she really gets the hang of it, you can hide the toy anywhere. Being a scent hound, she will love this game.
Never leave your dog tied up outside of a store. Even if you can see her, it's irresponsible and your dog could get stolen or hurt in even the nicest towns.
It's only been two weeks, but your dog has great potential. Don't discard her before you've really tried to work with her. It's very mentally damaging to a dog when they get sent back. After two weeks, she's attached to you and loves you. No matter what she does wrong, she'll never understand why you've abandoned her.