Or maybe, with her superior wisdom and insight, she realised after she had rejected the ring what her future now held.
Remember, she also says "I will diminish, and go into the West, and remain Galadriel." Her original reason for leaving Valinor was her wish to rule her own kingdom. She sees the return to Valinor as a diminishing - ie not an entirely positive thing.
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Out went the candle, and we were left darkling
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