Conversation so far:
Has Rosa Ponselle ever perfomed overseas?
Outside the USA, Rosa Ponselle sang only at Covent Garden in London and in Italy.
What year did Rosa Ponselle begin to perform in London?
In 1929, Rosa Ponselle made her European debut in London, at the Royal Opera House at Covent Garden.
When did Rosa Ponselle finish her career?
Rosa Ponselle's last operatic performance was as Carmen on April 22, 1937, in a Met tour performance in Cleveland.

Question: What did she perform later in her career?
Self-contained rewrite: What did Rosa Ponselle perform later in her career?