Since she is wandering off and not continuing to push for your attention it sounds like she is reading your turn away corrrectly. When you turn away from a dog it is a distance increasing signal.
When you turn back and invite her back to you, what does she do?
Remember she is still young and learning self-control. This sort of behavior is related to your other post about her having difficulty holding body position for extended periods of time. She is still learning self control.
I like Levels because it breaks the training up into smaller parts, http://dragonflyllama.com/%20DOGS/Levels/ByLevel/1Level.html