How does Lady Macbeth change during the course of the play?Discuss with particular reference to Act 1 Scene 5 and Act 5 Scene 1. Please give...

Lady Macbeth, in Shakespeare's Macbeth,
reverses gender roles with her husband at the beginning of the play, only to
revert to a traditional gender role by Act 5.1. 

Lady
Macbeth wants to be "unsexed," in Act 1, to be made warlike, like a male warrior.  She
wants to have no scruples when it comes to doing what's necessary to achieve the throne
for her husband--assassinate the king.  Macbeth has scruples and hesitates, but his wife
does not.

Furthermore, in Act 2.2, Lady Macbeth feels no
guilt and no regrets for plotting to kill the king, as her husband does.  A little water
will clear us of this deed, she says, while Macbeth metaphorically says that not even an
ocean could wash all of Duncan's blood from his hands, and also wishes the knocking at
the castle door could wake Duncan
up.

By Act 5.1, however, Lady Macbeth reverts back to the
traditional role of a female.  She now demonstrates scruples and feelings of guilt.  Now
that her husband has gone on a killing spree, she sees what her actions and manipulation
have led to, and she regrets and feels guilty for what she's
done. 

Lady Macbeth flip flops roles with her husband, so
much so that she suffers a break down and ultimately commits suicide.  One certainly
can't see her doing that in Act 1.