What do you think happens to Ettie at the end of the play?

Ettie and Birdy leave for California. She later dies in the United States.

From Chicago he went under a changed name to California, and it was there that the light went for a time out of his life when Ettie Edwards died.

Ettie dies at the end of the play by a disease.

"I've simply to mention that,once he revealed his true identity as a Pinkerton detective,the railroad sent a special train to collect him and his bride-to-be,Miss Ettie Shafter,that very night"."At least they had some time together as a reward,before she was taken by disease".