I think they are cruel!! this is a very heated topic. I would never ever use them on a dog. I don't know why the heck people think they are doing selling them!
I personally hope you don't get one. Do you take her to puppy classes? Do you have any dog parks near you that you can take her to run off her energy?

The reason I am saying for you to not get one is because my grandfather had a chesapeake bay retriever he used for hunting. She lived outside in a kennel. He used a shock collar on her because of her barking and you know what? It made her worse. I don't think anyone would want to be shocked when they do something bad. especially not an animal. They won't understand it IMO. Anyways, he misused it with her and not my grandma (she passed away when I was 5) his wife now gave her away to a family with kids who treated her right.

I certainly wouldn't get one EVER or recommend one.