A girl in a floral dress cries on a sand dune.
A girl is outsie crying.
A sand dune is a sand hill outdoor. So she is crying outside.  (Typo on your sentence 2: outside, not outsie)
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & on(x2,x4) & n_dune(x4) & of(x4,x5) & n_sand(x5) & n_cry(x2) & of(x2,x3) & n_dress(x3) & a_floral(s1) & Theme(s1,x2) & n_girl(x1))
exists p1 x1.(exists s1 x2.((x1 = x2) & n_crying(x2) & a_outsie(s1) & Theme(s1,x2)) & n_girl(x1))