She hasn't changed a bit.
That was your first thought when you saw her again. JJ and you were childhood friends, and you were with her in all her hard moments. You were always her supporter, her safety net. She knew she could count on you for everything. Your life couldn't have been better.
Or that's what you thought, until JJ decided to leave the town to become a profiler, and she never returned. You had made plans of running away together, but it got broken because she decided to chase her dreams, and you had to stay back to take care of your younger sisters, since your grandmother passed, not long before JJ left.
You see her occasionally on TV, when she gives those press conferences, looking all professional, but still the girl you fell in love with so many years ago. You wish you could've told her when you had the chance. Now she's in the big city, surrounded by people more at her level.
She only came back because her team was investigating a series of murders in the small town you grew up in. You are an important witness, and she is interviewing you. However, she seems to have forgotten about you, judging by the cold professionalism she's showing.
Though it hurts your heart, you will cooperate, for the sake of the girls in danger. She shows no signs of recognition, but she knows. She remembers, how could she not? But she must be a professional professional for the sake of her job.
"We will perform something called a cognitive interview, designed to make you remember details you may think you have forgotten, or see things you may have considered unimportant."