Hey Navy, if I was looking from your wife's POV, I would imagine she is going through emotional and (maybe) intellectual chemotherapy. As y'all attempt to build your marriage, you can definitely attest that it's hardly ever easy or hunky-dory - and some days are more difficult and painful than others. What I'm trying to say is, in order for your wife (and you) to work upward, she is faced with processing things fast and furious, and sometimes, it shows, like how you described above.
Call it detoxing or some sort.
Let's just hope she doesn't hang on to that negativity for too long, otherwise it will brood. Only she can control that.