Of course I am jumping to conclusions since you didn't mention her play schedule, but it may help. Add a dog house and a pool in it, put it in a shady area, and you will have no distruction. If I understand correctly, this dog is left alone outside during the day. There's the problem. Goldens like most hunting breeds need a job to do sitting in a yard all day is causing destructive behavior.
Dogs quickly lose interest and pretty much stop digging.
Also dogs feces and cover with dirt. I believe that boredom is the problem. My neighbors yellow lab did that until they put a lot of toys out in the yard to amuse the dog. Call a local obedience school and ask for some advice. Better yet, call a local Golden Retriever Rescue organization.