What emotion would an audience feel for Juliet at the end of Act III, Scene 5?
I would say that an audience (at least in modern times) would feel pretty sorry for Juliet by the end of this scene.
In this scene, the adults who are supposed to care about Juliet have not acted very well. Really, they have been pretty horrible to her. Her father, in particular, has said some really nasty things about her. And all of this is simply because she does not want to marry Paris the way that they want her to.
At least today, an audience would surely feel sorry for Juliet. They have seen her being berated and really abused by her parents for wanting to be her own person. Nowadays, that would really get us on her side.