I'm sorry you're going through this. The journey to recovery can be very hard. If your wife could be admitted to rehab again, bring her -- whether you're staying with her or not. That's not to try to save her, but to turn this over to others who have the ability to deal with it. There are stories of 6 times through rehab and still drinking. Although once through works for some people - especially if they continue working at their recovery afterwards - there are also successes that have come after 2 or more times through. It took my husband's counselor 4 times going through rehab to sober up for good (varying amounts of dry time in between). He said it wasn't a comprehension problem, but implementation problem with him.
Are you actively working a recovery program for yourself? One day at a time. Take care of YOU.