Answer:
She decided not to buy the "tarnished old silver container with a long spout", which seems to suggest that she is a changed person after her experience with Sir Galaad.
Explanation:
Neil Gaiman's short story "Chivalry" revolves around the Holy Grail and the <em>"quest"</em> that sent Sir Galaad to retrieve it. The short story delves into the themes of chivalry, ritual, deities, and folktale.
Mrs. Whitaker had acquired the chalice at an old items shop called <em>"Oxfam Shop"</em>. And once she put the Holy Grail on the mantlepiece, Sir Galaad arrives to retrieve it. After numerous attempts to make her agree with an exchange, she relented and gave the Holy Grail to Sir Galaad.
At the end of the story, we see Mrs. Whitaker once again in the shop, about to buy a Mills and Boons novel and a <em>"tarnished old silver container with a long spout"</em> which, on second thought, decided not to. And in her opinion, <em>"it wasn't as if she had anywhere to put it"</em>, which is suggestive of her changed behavior.