My wife [28F] has gone off the rails

My wife and I have been together for 6 years and married for 3 years. We have a 4 year old daughter. For reference my wife is a SAHM and I work full-time. <br><br>My wife used to be a very tidy person, but in the last year it has become a major problem. I have to regularly clean our entire house while also doing laundry, dishes, feeding my daughter, and changing my daughters nappies. I work 12 hour shifts so this is also on top of my already busy schedule. <br><br>Recently my wife has started to become very aggressive and irritable. She regularly yells at me for no reason, and screams at our daughter for no reason at all. For example yesterday our daughter accidentally knocked over a cup of water and my wife started screaming at her and telling her that she's stupid. I told my wife to stop and that she needs to be more patient with our daughter but she told me to mind my own business. <br><br>She also regularly leaves our daughter alone and unattended for hours at a time. I'll come home from a long shift at work and find my daughter playing by herself in her room, and my wife in the bathroom taking a 3 hour bath. <br><br>I have tried to talk to my wife about all of this but she gets defensive and tells me I don't know what I'm talking about. She also started saying that I don't deserve her and that I'm not a good husband. <br><br>I don't know what to do. I've never seen my wife act like this before and I feel lost. I feel annoyed at how selfish she is being and I feel bad for my daughter having to go through this. <br><br>What do I do? And any advice on what I should do about our daughter?