Dear German,
Wise decision to postpone the wedding. You don't need the added heartache of having to take over financial responsibility for her. If married your names' were on things together, you'd be the one they'd come after if she didn't pay.
As long as she's drinking, try living your own life. Seek help at alanon as well as the couples counselling you're attending. She's going to do her thing. So might as well do yours.