Her team did their absolute best at their last game/match of the year.
"彼女のチームは今年最後の試合で一生懸命がんばりました。"
Her team did their absolute best at their last game/match of the year.
Her team worked hard and did their best at their last game/match of the year.
彼女のチーム = her team
今年最後の試合 = last game/match of the year
一生懸命がんばりました = did their absolute best; worked hard and tried their best; did their best