>>1982834Try making it so that your dog believes you're the best thing about being outside.
My dog loves tug-o-war, so whenever we go out she'll play that for hours over anything else. Just do something with your dog that you know your dog loves, get into that habit so when you call her, you also initiate play. Over time it should sink.
Also what I noticed about shepherds (perhaps other dogs as well) is that they don't want to be left alone. So as
>>1982845 wrote, try moving away from the dog as well to have her chase you.