Don't try to "control" her. She's got to do it for herself, for her kids and for you. Also I hope she's been advised that this is a very tricky period for her. Getting back to the old environment will bring back all the associations with alcohol and there will be subconscious urges to "resolve" those anxieties in the old ways. She'll need lots of support, medically and with counseling, hopefully the support of other recovering alcoholics. Let her know that you all love her, that she's been ill, that she can get well. That she will get all the help possible but that it's up to her. It's a long, upward road, one day at a time.
W.