NotVeryHappy,
I am sorry to hear all that you and your girls have had to endure. I am sorry for their mother and the self-created Hell she is living in! If you feel the need to call the police and have them perform a welfare check, then by all means do so. I suspect, however, that the outcome will not be any different from the last welfare check...only her language may be more colorful.
The gut-wrenching part of this disease for us (the friends and family) is that there is absolutely nothing we can do to alter the trajectory of it. We can encourage our loved ones to do the 'next right thing', but whether they do so or not is entirely up to them.
As you have experienced, the success of rehab depends entirely on whether or not the active alcoholic truly wants to change. Sadly, it sounds as though your wife is not there yet.
Please take good care of yourself and your girls!!