Considering what you wrote regarding the backstory, I'd say the most immoral thing you could do at this point would be to yourself by going back to "help". If she gets admitted, that will probably be a good thing as she'll be able to get some help, detox, time, etc. and be able to calm down before she's released.
I can completely relate to the knee-jerk feeling of wanting to "help" or fix her sad situation. It's part of why we stay with our addicted partners long after the relationship is dead; feeling guilt, responsibility, fear of what will happen to them. Almost like a child.
It does sound like getting an attorney would be the next right thing to do, and those Motel 6 temporary/corporate weekly-rate things can be a nice way to stay separate without making a big commitment of money, lease, rent.