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Selfishness is the one of her many faults which defeats itself.
I don't blame you for being puzzled here, Chuncan Feng. To look at the sentence carefully, word by word, it doesn't make sense.
I think the meaning is that selfishness is a self-defeating quality. In other words, selfishness is one of her many faults which contribute to her failure as a person.
Perhaps we might rephrase the sentence:
Her selfishness itself is self-defeating to/for her.
In this case, the selfishness defeats her, not itself. _______
If her selfishness actually could defeat itself, it would be a blessing for her! She would be a nicer person because she wouldn't be selfish any longer.