I blame the wedding cake
No, seriously, being you are still newlyweds so to speak, is there any chance your wife is on birth control?
It may sound nuts, but my wife and I decided to wait on having children for at least 5 years after we were married to "enjoy" one another if you know what I mean. To be extra careful, she was put on birth control along with me wearing protection. Like I said, we wanted to be very careful.
The problem is, she starting acting just as you have posted and we found out it was due to the pills. She had them changed to a different type and it made all the difference in the world.