Who is this lady?

[Eva Elisabeth]

Kudos, Gene and Roger - that is correct. Isabel reminds me of "Schöne Isabella aus Kastilien" by the Comedian Harmonists, an all-male German close harmony ensemble that performed between 1928 and 1934 as one of the most successful musical groups in Europe before World War II.

In 1927, unemployed actor Harry Frommermann founded the group, inspired by The Revelers, a jazz-influenced popular vocal group from the United States, to create a German group of the same format. After some initial failures, the Harmonists soon found success, becoming popular throughout Europe, visiting the United States, and appearing in 21 films. In the early 1930s, they ran into trouble with the Nazi regime: three of the group members were either Jewish or of Jewish descent, and one had married a Jewish woman. The Nazis progressively made the group's professional life more difficult, initially banning pieces by Jewish composers, and finally prohibiting them from performing in public. The group's last concert in Germany was in Hannover on March 25, 1934 after which they sailed to America on SS Europa and gave several concerts. Fearing internment if they stayed abroad. They eventually returned home, but three members finally fled Germany again. Although all members survived the war, they never re-formed after the war.

Here's the song (in a 1997 docu movie - skip a bit forward):
http://m.youtube.com/watch?v=qNMJ_bQ2EIs
The chorus is about:
"Beautiful Isabella from Castile
Gather all your utensils
and come back to me to Spain.
You know, only in the land of the toreros
You lose your little heart and more
So come back to me to Spain."

Their music is still popular:
https://m.youtube.com/watch?v=svZSl0c3l8c