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put a e-collar on but do not use until she can respond to commands off leash which takes time but collars dont train them, just ruin a great dog if not used correctly! Good luck hope this helps
i’m glad you brought that up!
the e-collar is one of the most effective tools in dog training…IF…used properly. like riverrat stated above, it is not used to “train” a dog. an e-collar is used to enforce known commands, and if you are planning on using an e-collar, please run the dog through a “collar conditioning” training phase. It will pay off in huge dividends, and you will not risk “breaking” your dog.
DeerTracker, if you were closer i would invite you with to help you on the yard work you will be doing for the next 6-8 months. if you ever are going to be down this way, shoot me a PM if you want to get together and run dogs! 
also, if you can, join a local retriever club, there will more then enough people that know what their doing to help you through the paces.
and for any dog training questions/info, by far the best site out there is http://www.retrievertraining.net/forums
Remember DT, you can always take the desire out of a dog….but you can never put it back in.