Yeah, I only recently found this out and was computing for a couple minutes straight. Turns out she was about sixteen when 'Herzfrequenz' was released. This of course means that she neither wrote nor produced the songs, unlike Marusha for example. Worse even, I've looked through her more-recent albums, including those released in 2000s-2020s under her actual name Jasmin Wagner, and she's not credited as the writer or producer on any of them.

That said, her songs are certified bangers.