According to the Nora Hulse
in her 60 Years of Ragtime Piano
, Veronica Mikova [Miko] was a Hungarian born American musician and Vaudeville performer. As a child she studied the czymbalon in Budapest and went on to perform in USA and made many world tours. She used Gypsy Countess Verona as a stagename
. She is said to have made two recordings and of ragtime interest is her only composition Gypsy Rag
For data housekeeping purposes she is listed in these webpages as a one-off composer.