A teenager plays her trumpet on the field at a game.
The trumpet player was a girl.
A teenager plays her trumpet just means trumpet player was a girl.
exists e1 x1 x2 x3 x4.(n_field(x3) & at(e1,x4) & n_game(x4) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_trumpet(x2) & of(x2,x1) & n_female(x1) & n_teenager(x1))
exists p1 x1 x2.(n_player(x1) & of(x1,x2) & n_trumpet(x2) & exists x3.((x1 = x3) & n_girl(x3)))