Don't make much of any of the purchases, in all likelihood that's her just trying to create her own identity and create her own space. As I understand it this it fairly normal behavior. Shoot even I went out and bought some new clothes, a car and some additional furniture. Life goes on, households have to be taken care of, clothes replaced. Its all just part of life and in this situation there a little freedom in the decision making.
My wife has done the clothes, new car, painted parts of the house, new bedroom furniture thing. You know the odd thing, she asked my about all of it at some point. Shoot the car was a big deal and I was glad to assist her in helping her make a decision. I offered up objective thoughts and kept my personal opinion out of it and all the other things too. She appreciated it all and has said so.
So remember its just her taking advantage of the little bit of freedom she feels she has now, nothing more, no underlying messages to you or about your relationship.
If we really want to love, we must learn how to forgive. - Mother Theresa