From what I read, Sinead originally dislocated her right shoulder. In the SC Gala, she lifted John with her right arm around his waist. At one point during the lift, she let-go with her left arm and pumped her fist in the air. At that point, she was supporting John's weight with her right arm only. She didn't appear injured afterwards, as she finished the Gala without any indication of pain. However, it is possible the pain could have manifested itself later. On the other hand, it is also possible the injury could have occured during training after returning to their home rink.
Hopefully the injury isn't too serious.