I disagree about approaching her in a manner that is confrontational. Truth is that she is probably very tired. Being a mother is a new experience for her and it is very draining and taxing on your time and emotions.
Perhaps you could try to offer to take up some of her work load or even offer to care for the baby so that she might enjoy a relaxing bath or a nap or even a lunch date with a friend. After a couple of times like that with you doing it to be nice and not expecting something in return she will probably reward you.
The best advice I can give is to put yourself in her shoes. I know this is a bug adjustment for you and it is normal to feel a bit slighted by all of the attention that the baby is getting that used to be just for you. But the last thing that you want to do is add more stress to your wife and potentially make the situation worse. Be calm. Be patient. Be understanding. Be helpful. It will get better.