How long should I put up with my girlfriend and her alcohol relapses?

I have been in a relationship with my gf for 5 years. While at first she had always been a “weekend drinker”, it eventually over the past 5 months has progressed to being a “closet drinker”. I wake up to her at 2 or 3 am sometimes literally hiding in the closet with her 5th of Vodka. She has hiding places all around our home. She has been in rehab 4 times within the past five months but always relapses after 3–4 days. She has lost her job and I have taken care of our 3 kids and all of our bills. Her family has given up on her and she will lose everything if I choose to do the same. I love her and she says she wants her life back but she keeps messing up. She was arrested tonight for domestic violence for freaking out and hitting me as she fought for her car keys. She was drunk and called the police and said that I hit her which was untrue. They knew she was lying because they have dealt with her before. How much more should I take?