Are you training her for anything in particular? I started Shelley in Obedience at 12 weeks - she passed beginner, intermediate and was in the advanced course when our trainer suggested that we should try Agility.
We never looked back. She was a little wild in her first couple of trials, but now she is incredibly focussed and very competent. The Agility training has done a lot to settle her down. She HATED Obedience - "you mean I have to just, like, SIT for five minutes?!?!?!? Whazzup witat?"
I'll be honest. She's my wife's dog. Unfortunately, though, my wife does not play with her like she should, so I do it. That was a rough test, though. It did not take long for her to start following me around the house and terrorizing me--eating my stuff while I wasn't looking. She ate the keys off my laptop, for example. Not good. Fortunately, she seems to have gotten over that for the most part.