It sounds like she sings "fudge you, soda!" It sounds a lot more like it on the 12/13 second mark "smurf a lot" or possibly "smurf like a" which is followed by a c-word which could be one of two things, both of which are dirty. The big grin on her face at the time says it all.

I'm analysing German LazyTown videos for naughty words. I think I've hit bottom.