Juliet is not present in Act III Scene iii, but the Nurse describes how she is feeling when she is talking with Romeo and Friar Laurence on her behalf.
"O woeful sympathy!/ Piteous predicament! Even so lies she,/ Blubb'ring and weeping, weeping and blubb'ring" (III.iii.87-89).
The nurse then tell Romeo to be a man and be strong for Juliet. Romeo asks how Juliet is doing, as if the first comment weren't enough, and she says,
"O, she says nothing, sir, but weeps and weeps;/ And now falls on her bed; and then starts up,/ And Tybal calls; and then on Romeo cries,/And then down falls again" (I.iii.101-104).
Thus, Juliet's heart breaks for both Tybalt's death and Romeo's part in it (and his banishment). She's calling out for Tybalt and then for Romeo; she is certainly conflicted with feelings for both men in her life.
We know of Juliet's feelings in [3.3] only because of comments made by the Nurse; the quotes given by tinicraw are spot on. If we assume Juliet feels the same in [3.3] as she did in the previous scene (and we are justified in doing so), we can describe her as having conflicting emotions for two important people in her life. She is at once sad for Tybalt's death, but more importantly, she is distraught over Romeo's banishment.
It is important to note that while Juliet weeps over both Tybalt and Romeo, she is relieved that Romeo is alive, and says plainly that she would rather Tybalt be slain by Romeo's hand than the other way around. For while Juliet first curses Romeo ("Beautiful tyrant! Fiend angelical! ...Was ever a book containing such vile matter/So fairly bound?...), she gets angry at the Nurse for doing so ("Blistered be thy tongue/For such a wish! He was not born to shame./Upon his brow shame is ashamed to sit...). And in lines 105-108, "My husband lives, that Tybalt would have slain,/And Tybalt's dead, that would have slain my husband./All this is comfort. Wherefore weep I then?"