Behavior like that is over the edge, even for us alkies. Here's the deal when it comes to psych wards, especially county-funded: I used to walk into hospitals meek and mild, thinking and hoping I would get sympathy for my miserable self. Didnt work. I quickly figured out that if I used the same amount of energy towards getting help as I did getting drugs that I always had help. I would do ANYTHING to get drugs or alcohol-when I applied that to getting admitted, I got admitted.
If you think your friend is a danger to herself, lie your ass off. Call 911 and say she has a knife at her throat...or your throat. Tell them you just pulled her from the freeway overpass, or that she tried jumping in front of a bus. Tell them she has a PLAN and the means to carry it out. Do whatever you have to do friend. Just get her safe, and make sure your safe. You can always make amends later...