How does the character Eva changes to the character Evelyn in the Kindertransport play?

Kindertransport is a play written by Diane samuels.

I'm not familiar with this play, and I doubt that other tutors here are, either. If you have read the play, you should know the answer to this question. You may want to read it or re-read the part where Eva becomes Evelyn. Maybe this will help:

http://www.stageagent.com/shows/play/3586/kindertransport