Marriage not on the same page

First, I love my wife very much! We just got married four months ago. However, it's kind of like she has changed. One day she is positive and happy. The next day she is acting like a bitch. Before we got married, she voluntarily sent me all her expenses since "we would be sharing the bills, etc." Before we got married it was like we were on the same page. Now, we are not. I signed us up for Dave Ramsey a several weeks ago (she was on board)then she backed out and doesn't want to share expenses. I keep trying to plan for our future - trying to sell my house, plan for her child's college fund... get all her stuff out of her house.. blah, blah, blah. She at first is telling me yes about things and plans then puts up the wall and says no. It keeps me in a state of confusion. She never follows through with anything she says. She was not like this when we were planning to get married. What do I do.