Not much to say about Olga Lowina. She was a Dutch vocalist, specialized in yodeling. The Yodeling is a form of singing which involves repeated changes of pitch during a single note. The singer quickly switches between the low-pitch chest register and the high-pitch head register or falsetto.
Alpine yodeling was a longtime rural tradition in Europe, and became popular in the 1830s as an entertainment in theaters and music halls.
Quite interesting album!