How does Shakespeare make an audience sympathize and empathize for Juliet?

Of the two lovers in Shakespeare's Romeo and
Juliet, Juliet is not the initiator of the meeting, nor is it she who
proposes marriage.  In fact, she probably would not pursue the relationship with Romeo
after he introduces himself and begs to touch her hands.  For, when she is told who
Romeo is, Juliet says, "Too early seen unknown, and known too late!"
(1.5.148).

Always she extorts Romeo to be cautious:  She
backs away at the party from kissing him:  "Saints do not move, though grant for
prayer's sake" (1.5.110), and she is anxious about their
relationship:

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If they do see thee, they will murder
thee.....

I would not for the world they saw thee here
(2.2.74,78)

So frequently,
Juliet cautions Romeo against his impetuous pursuit of her, telling him to go more
slowly and not to swear his love by the moon or anything
else:

...I
have no joy of this contract tonight. 

It is too rash, too
unadvis'd, too sudden;

Too like the lightning, which doth
cease to be

Ere one can say 'It
lightens'....(2.2.122-125)

More
than anyone else, Juliet seems the victim of fate.  Happy with her new marriage, she
soon learns that her beloved cousin has been slain by her tragic husband who has then
been banished.  Adding to her woes, Juliet soon encounters her mother who insists that
she marry Paris. Even her Nurse encourages this marriage--knowing such a union would
be bigomy--and Juliet feels isolated in her consternation. Placed into a terrible
quandary, Juliet seeks the advice of Friar Laurence who has her drink a potion that will
have the apparent effects of death in hopes of causing the parents to regret their
decision.  Hopefully, then, when she revives, they will be reconciled to her marriage to
Romeo.  But, before the young and delicate Juliet consumes this vial, she suffers
tortuous fears that she will die, or if she does not, she will lose her mind when she
awakens in the catacomb with skeletons, or she may not be able to breath in the tomb and
die even if she does awaken.

Certainly, young Juliet
endures many tribulations in the course of the three day romance with her Romeo.  Her
unfortunate awakening too late and finding her beloved dead is too cruel for such a
young innocent.  She is, indeed, one to whom great sympathy
comes.