I think it may have been french, and had english subs. Definitely an indie. And it was about a girl who refused to speak, and gained powers from her mutness. She also daydreamed of her father on the beach, burned her house down, and dyed her hair green.
Is this it? “Mermaid” (2007)
http://en.wikipedia.org/wiki/Mermaid_%282007_film%29