Why does Abigail tell her uncle that she was dismissed from her place as the Proctor’s servant? What is the real reason?

Abigail tells her uncle that Goody Proctor simply hated her because she wouldn't act as her slave. "She hates me uncle, she must, for I would not be her slave. It's a bitter woman, a lying, cold, sniveling woman, and I will not work for such a woman...Goody Proctor is a gossipy liar!"

In truth, Abigail is dismissed because of her affair with Elizabeth's husband, John."