Question

that seemed quite absurd and undignified from her part explain with the context to the lesson the Portrait of a Lady by Khushwant Singh

Answer 1

Answer:

The expression ‘that seemed quite absurd and undignified on her part’ means the author would never believe his grandmother when she used to tell him about the games she used to play in her childhood. The narrator, Khushwant Singh believed so because he thought her grandmother had always been old. She had been the same all the time he had known her.

Answer 2

Answer:

It was the childhood games that Khushwanth Singh's grandmother which "Seemed quite absurd  and undignified on her part". Khushwanth often treated them as fables of prophets told by his grandmother, as quoted by him.

I did my best, and I hoped I helped!