Ok. I present you some Polish/Czech (maybe mainstream, but hard to classify) young vocalist. She just turned 16 and this video is from 2009. She reminds me Lili in some way, but it's only my personal opinion.
Ewa Farna - Dmuchawce, latawce, wiatr
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(If that won't work try
this.)
And second clip, but at age of 13, she sings in Czech language
Ewa Farna - Měls mě vůbec rád
(not allowed to embed, and it that won't work, try
this(poor quality))