this was a new phase just this last month what new phase is reffered to here in should wizard hit mommy?

The new phase mentioned here refers to the new level of understanding that Jack had observed developing in his daughter. Now, she had started wondering what was real and true and what was not. Since the last one month, she had consistently started enquiring about the reality and truth of all the things that were told to her. He calls this new phase as the 'reality phase'.