For all the people asking out Nina in season 3:
It is true. Natalie Ramos will NOT be in season 3. She said so on tweeter. She will not be on because of school work. She wants to focus on school and not on acting.
However, Nina still might be in season 3 but they will have to have a new actress to play her role (I know that sucks right?). This will not be new the the House of Anubis people. In the original House of Anubis in the Netherlands (Or Het Huis Anubis), the person who played Alfie (or Alppie as they called him there) got a role in a movie. So to keep Alfie (or Alppie) in the show, they changed his appearance por making something happen to him. They may do the same to Nina.
If they don't do this, than they will most likely make something happen to Nina (like moving back to the USA) and make the whole season 3 about Eddie and his Orisren powers.
If you have anymore questions, please ask me and I will be happy to answer them.