Since most dogs love to go for walks, I find it rather odd that your dog, especially as a pup would prefer to stay in her own yard. Did something happen on one of your walks that frightened her?
You also mentioned that she is choking herself when pulling back from you. What type of a collar are you using?
Normally, we hear the exact opposite of the dilemma you are encountering. Usually the dog pulls so hard to move forward that the handler has a hard time holding on to the dog.
Have you taken her to any obedience classes or any classes at all?
You also mentioned that her dislike of going for a walk is only sometimes and other times she will heel and walk very well. Have you noticed a pattern with her unhappiness to walk, such as weather, time of day, or something else I've not mentioned?
I know there is a solution to be found, only I'm not sure what it is. I am more curious at this point as to why this is from time to time. Is she walked only by you, or are there other members of the household who participate in her training?
Despite having Goldens most of my life, this is a mystery to me and seemingly quite uncharacteristic for a Golden. I hope some of our other members are able to shed some light on this.
The only tangible suggestion I have at this point is to start keeping a journal of when this happens, with whom, the weather, and time of day and see if a pattern emerges.
Best of luck to you.