Question

Why was johnsy counting the leaves of the ivy vane?

Answer 1

She was measuring her time on earth in that way. She was waiting for last leaf to fall, so that would mean the end of her life too.

Answer 2

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Johnsy had made up her mind that the day the last leaf fell off the creeper, she would die. So she was counting the leaves as they fell off the creeper.

hope it helps you....