Given her bookishly shy demeanor and a willingness to step back and let others shine under the spotlight, Shannon Emerick hardly seems like much of a star. Yet when she moves across a stage, something in her deeply intelligent gaze takes over. It's difficult to take one's eyes away from her face, as it's so full of contradictions and subtle hues of emotion. Gentle and mesmerizing as ever, Emerick stole the show in Main Street Theater's production of Wondergirl,a profoundly sad tale about a woman who loses her daughter in the neonatal unit before ever taking the child home. As the plaintive mother, Emerick turned what could have been a maudlin melodrama into a thoughtful examination of the sometimes contradictory nature of modern medicine and the human heart. Emerick's quietly intelligent and intensely moving performance captured a profound truth in this ordinary tale. And when the lights came down, all we could do was weep for the mother she created.