Isa Climbs the Tube

Today Isa climbed the Big Yellow Tube all by herself. We have never helped her to do it before, we just let her fail because we really didn't want her getting up into the loft. Today when I climbed up to play a game with Leo, she was ticked off and decided to climb up, too. So now I'm wondering how I'm going to keep her from getting into the paper books and magnetic toys.