Who found Veronika passed out in her apartment?

I think her neigbours found her but they also could have called the security or the janitor of the apartments. Veronika played very loud music at 3am so I guess her neighbours would have complained about that, and because nobody openend they may have broke the door to get in.

Yeah, either that or her mother? There was something about her having dinner with them later that night earlier in the movie.