Lady in short skirt plays music outdoors.
The lady in short skirt is playing her ukelele with the band outside.
The lady could be playing any instrument and she could be playing solo, nothing in the sentence implies that she plays a ukelele with a band.
exists e1 s1 x1 x2 x3 x4.(ne_nam_lady(x1) & in(e1,x4) & n_skirt(x4) & a_short(s1) & Theme(s1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_outdoors(x2) & of(x2,x3) & n_music(x3))
exists e1 s1 x1 x2 x3 x4 x5.(n_outside(x4) & of(x4,x5) & n_band(x5) & n_ukelele(x3) & of(x3,x1) & n_female(x1) & n_lady(x1) & with(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & in(x1,x2) & n_skirt(x2) & a_short(s1) & Theme(s1,x2))