Wow, what an issue. I think your wife drinks to numb her feelings. SHe uses alcohol to escape from life. Sorry, that's just how I see it. Most people I know don't drink on a weekly/nightly basis. I think you might be fooling yourself into thinking that is "what most people do". the one's I know who do have a problem with alcohol and hence, other problems as well.
I am so sorry you are going thru this on top of the simple WAW thing. It just compounds the problem.
I think you wife needs to get out of the house, get a job, and interact daily with other adults. She seems to be missing that. I know I did when I was home all day with small children. I think she is just afraid to admit it, thinking she is a "bad mom" if she admits to needing something more.