Conversation so far:
when was lucy's final appearance?
in May, 1893.
where was the final appearance?
at the World's Congress of Representative Women.
what was the reason for the congress?
focus was on state referenda under consideration in New York and Nebraska.
why was it the final appearance?
Stone was diagnosed as suffering from advanced stomach cancer.

Question: what did she do at the conference?
Self-contained rewrite: What did Lucy do at the conference?