The old lady is Sarkar's grandmother. How the heck is she alive?
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~Well, her backstory is that she found the hidden treasure when she was young. But she was attacked by Hastar and was cursed with eternal life without eternal youth.
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~ Like Hastar, she is always hungry, and when someone utters the phrase, "sleep, else Hastar will come", she goes to sleep.
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~Vinayak's mother has been feeding the old woman for years as part of her quest for that single gold coin.
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~When Vinayak and his mother leave town, they let the grandmother rot in their house. Years pass, and a tree grows through her, but her curse keeps her alive. Ouch!