In the chronological order

Viola Uotila, only one song (Koivu)
Assol', a few songs
Cleopatra Stratan, many songs
Milana Gogunskaya, only one song (Zerkala)
Amelia Uzun, two or three songs

It has happened only twice during the last couple of decades that someone has recommended me a certain musical piece and I have liked it. At the first time is was a little girl singer (Cleopatra), at the second time a violin piece played by an adult man (Gideon Kramer). Unfortunately I am not favourable ground for any recommendations.

I may search for more songs by the girl you recommended, but later, because now I am desperately trying to solve a certain (theoretical) problem.