She sings in both German and English. Her first album Mamani and her latest album Maureen, which is her middle name, are predominately in German. Her second album Born & Raised is in English and features some US American rappers. Here is her page on Grooveshark.
The first video can not be viewed in Germany, because media companies are annoying and blocked it. Hopefully you can view it where ever you are!
This video is from her New Album Maureen that came out earlier this year