Like a_blackpanther stated above, she expressed no desire to be a profiler in season 2. Now, we're in season 7. It's possible that JJ changed her mind since then and that being away from the BAU made her realize that. Or maybe it was the only way that the BAU would let her come back. Who knows.
I just hope that the writers give us some explanation on it.
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I just hope that the writers give us some explanation on it.