In "The Necklace," I need three quotes from the story to show that Madame Loisel is ungrateful.

There is certainly plenty of evidence to show Madame
Loisel's dissatisfaction with her lot in life! You might want to start out by examining
the beginning of this story and the way that she is presented. Consider, for example,
the way that she is shown to "grieve incessantly":

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She grieved over the shabbiness of her
appartment, the dinginess of the walls, the worn-out appearance of the chairs, the
ugliness of the draperies. All these things, which another woman of her class would not
even have noticed, gnawed at her and made her
furious.

It is clear from the
way that the narrator tells us that "another woman of her class" would not even have
noticed such things that Madame Loisel is profoundly dissatisfied with her position in
life.

In addition, you could use any of the lavish
daydreams that fill her day at the beginning of the story to indicate that she is
ungrateful. She clearly does not value what she has, otherwise she would not invest so
many hours in fabricating fantasies. Consider, too, her response after visiting her
friend who has done much better in life:

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She had a well-to-do friend, a classmate of
convent-school days whom she would no longer go to see, simply because she would feel so
distressed on returnign home. And she would weep for days on end from vexation, regret,
despair and anguish.

Such an
emotive response is rather hyperbolic, again reinforcing the profound ungratefulness of
Madame Loisel's character. She is very comfortable in life, but her desire for greater
wealth and prestige means that she is blind to how lucky she is.