A woman picking through her child's hair.
A woman is looking for lice
The woman could be picking through the child's hair for any reason, nothing implies that she is looking for lice or anything else specific.
exists e1 x1 x2 x3 x4.(a_topic(x1) & through(e1,x4) & n_hair(x4) & of(x4,x3) & n_child(x3) & of(x3,x1) & n_female(x1) & Actor(e1,x2) & v_pick(e1) & (x1 = x2) & n_woman(x1))
exists e1 x1 x2.(for(e1,x2) & n_louse(x2) & Actor(e1,x1) & v_look(e1) & n_woman(x1))