My old copy of Baker's has the following sketchy info:

   "Anna El-Tour, Russian soprano; b. Odessa, June 4, 1886; d. Amsterdam,
   May 30, 1954.  She studied at the St. Petersburg Cons. (voice with
   Mme.  von Hecke; piano with Essipova).  From 1913-20, she taught in
   Moscow; then left Russia; from 1922-25 was in Berlin; 1925-48, taught
   at the Conservatoire International de Paris.  After 1948, she was
   professor of singing at the Amsterdam Cons.  She traveled widely in
   the Far East; gave recitals in Israel in 1953."

I hope this is of some help to you.

Dick Hihn