I know what you are going thru. My wife has a problem too. She drinks a bottle of wine everyday. On weekend she drinks 2 bottles during the day.
She also sneaks to bars after work and quickly drinks a couple of drinks before she gets home. Sometimes she losses control and drinks herself to oblivion, but these events are rare. I am sure this will occur more frequently.
I think she has one more year before she starts drinking when she gets up in the morning. She is ill, very ill, yet she denies she has a problem and we are now seperating.
During the month of August she went on a binge. She was intoxicated everyday when I got home from work. (she has summers off), so I detached from her to cope. After detaching, she wanted to seperate.
My wife was just like yours, you could hardly tell she was intoxicated after a bottle of wine. Now its getting more noticeable after she drinks a bottle of wine. You know she's intoxicated.
I found that living with her has made me ill and I need to get better.
If your wife has a problem, you will notice the progression, it gets worst.