A 48-year-old female presents with acute-on-chronic heel pain. She had been training for a marathon for 3 months when she felt an acute pop near her heel and has been unable to bear much weight since. Prior to this event, pain only occurred during the beginning of her runs and slowly subsided. Her family physician had placed her on a regimen of daily stretching and night-time splinting for 2 months prior to this incident, but also administered a pain shot in this area 3 weeks ago. She denies recurrent ankle sprains. What finding do you expect on physical exam and what is her diagnosis?