Toddler helps bring about a medical miracle

<p>By Michelle Ponto /</p> <p>HOUSTON — Elena isn&rsquo;t your average little girl. At 20 months, she&rsquo;s already battled stage III cancer, and a spinal cord injury has left her in a wheelchair.</p> <p>Elena Porras with her mom, Juliet. <br /> Now, she&rsquo;s getting ready to fight again. This time, she&rsquo;s fighting for the chance to walk.</p> <p>&ldquo;She&rsquo;s paralyzed from the waist down, but from…</p>