I think if my player managed to score a hat trick, she would struggle to celebrate because of the pure shock she'd experience. A hat trick against a rival team that brings them victory in the last minutes of the game? Totally unrealistic so I'll assume she was sleeping soundly when that happened. So if we're talking about what she'd do to celebrate in her dreams, she'd just rub it in the face of the opposing team and their fans as much as possible. Jump on the window right in front of the other team's fans, especially if there are children present and look them dead in the eye. Then, do all the available EA NHL celebrations in front of the other team's bench. Especially the overly extra ones, like guitar playing or kayaking. She'd never dare do that in real life so might as well when no one can see.