Last Puzzles (Really Good Clever Riddle)

A young lady was approached by an elderly woman who took her hand and meeting her eyes said to her, "You look starkly similar of my daughter. I lost her last month. I loved her a lot. Can you do me a favor? Can you say 'Goodbye mother' as I leave this restaurant. I will feel good if you do." The young lady was puzzled but seeking her kind eyes, she agreed. As the elderly woman was leaving the restaurant, she said, "Goodbye mother" waving her hand toward her with a kind expression on her face. Soon after, she received the shock of her life. Can you guess what it was?

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