I need a good thesis statement and opener for a paper on "The Necklace."

One interesting element
of the story is theof Mathilde Loisel's dynamism.She is a character who changes quite
dramatically and in ways that we would likely not expect.Initially, "She had no dresses, no
jewels, nothing.And she loved nothing but that; she felt made for that."But, then, after
she loses her friend, Madame Forestier's, beautiful (though artificial) diamond necklace, rather
than become more sullen and miserable, "She took her part [...] all on a sudden, with
heroism."She knows that the horrifying debt she and her husband have taken on in order to
replace the necklace has to be repaid, and "She would pay it."Situational irony is
created when what actually happens is the opposite of, or at least very different from what we
expected to happen.We would very likely expect Mahilde to descend into even further dejection as
she and her husband are forced to move from their comfortable lodgings and into a cheaper
apartment as well as give up their serving girl....