I have experience similar dynamics in my relationship.
My experience is that it will not last. It can not last. She is acting like a 'normal' person and people that drink that much can not sustain that kind of effort/output.
Don't spend all your energy thinking about her and her behaviors. Take it one day at a time. Watch and wait and more will be revealed. The danger is that you project, plan, visualize a future based on that day - not on the reality which is that this is an alcoholic NOT in recovery.
Focus on you and your children so that you are still OK on the bad days - because they will be back and with a vengence.
Sometimes I picture or think of alcoholism as a monster. During these good days I someone thought my xah had managed to put the monster to sleep. In reality my xah just sent it off to boot camp to get stronger and meaner upon its return.