Hmmm. Am I there yet?

Whether the dog "knows" a command is subjective. There are guide dogs who run through a cue thousand, and thousand, and thousands of times before their handler will admit the dog "knows" the command. There are simply too many variables to always consider and could teenage hormones be one of them? Possibly. Nevertheless, the answer is remedial training...duration, distance, generalizing the behavior, adding distractions, and latency are all things you should work through to remedy this.

Corteo said:

She knows the commands. When she is not in one of her "moods", she is 100% on everything, all the time.

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All I'm saying is, there are different expectations on behavior between trainers - that's why it is subjective. Your dog may know sit 100% of the time when you say sit standing in front of him, but how well does he know sit if a stranger cued it standing on his head with a steak in his pocket? The difference is in one's criteria, and when a dog fails to meet your there is reason to question it, and thus, take a step back in training and reevaluate your criteria.