Tara was more than just Rocky's mom. She was his doctor, his nurse, his strongest advocate, his therapist, his teacher, his playmate, his care giver, his protector, his pharmacist and his closest friend. She devoted her life to Rocky and she made sure he experienced life to the fullest. She treated Rocky as if he was a 'normal' little boy and made sure he had fun every chance he could. When he was sick, she always knew what was wrong with him. Eventually, the doctors trusted her implicitly.
Nobody knew Rocky like Tara... and that's all there is to it.