A girl playing her guitar in her bedroom.
The girl is inside her house.
A person's bedroom is inside her house, so saying she is playing her guitar in her bedroom gives more information about where she is and what she is doing that saying she is inside her house.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_bedroom(x4) & of(x4,x1) & n_female(x1) & n_female(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_guitar(x3) & of(x3,x1) & (x1 = x2) & n_girl(x1))
exists p1 x1 x2.(n_house(x2) & of(x2,x1) & n_female(x1) & n_girl(x1) & inside(x1,x2))