A young woman sitting down on the ground having a healthy lunch at a hiking trail.
A young woman is having lunch outside.
Both sentences indicate that the person in question is a young woman. She is having lunch at a hiking trail. The trail would be outside, so the woman is having lunch outside.
exists e1 e2 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7.(n_ground(x3) & a_topic(x1) & on(e1,x3) & at(e2,x6) & n_trail(x6) & of(x6,x7) & n_hiking(x7) & Theme(e2,x5) & Actor(e2,x4) & v_have(e2) & n_lunch(x5) & a_healthy(s3) & Theme(s3,x5) & (x3 = x4) & a_down(s2) & Manner(e1,s2) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_woman(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_outside(x2) & of(x2,x3) & n_lunch(x3) & n_woman(x1) & a_young(s1) & Theme(s1,x1))