a female waitress server with a full tray of food.
The waitress is in the back helping to cook.
If a waitress has a full tray of food, the food has usually been cooked so she would not be helping to cook the food at the same time if the food is already ready.
exists s1 s2 x1 x2 x3 x4.(a_topic(x1) & with(x1,x3) & of(x3,x4) & n_food(x4) & n_tray(x3) & a_full(s2) & Theme(s2,x3) & n_server(x1) & of(x1,x2) & n_waitress(x2) & a_female(s1) & Theme(s1,x1))
exists e1 p1 p2 x1 x2.(n_back(x2) & n_waitress(x1) & for(p1,e1) & Topic(e1,p2) & Actor(e1,x1) & v_help(e1) & exists e2.(Actor(e2,x1) & v_cook(e2)) & in(x1,x2))