H4C, Have you thought about getting legal separation? It's not as final as a divorce and you can take care of custody issues and financial issues. Legal separations can be turned into a divorce if need be. You may want to contact a L for a consultation about this.
Something else I would do is start keeping a journal of incidents that involve your daughter like last night. If you don't write it down then, you forget dates and the info. Also document in your journal that she is bipolar. If you write everything down you have time to reflect on and make sure you don't leave anything you want your attorney or a judge to be aware of.
Hugs to you and your daughter...
Life's challenges are not supposed to paralyze you, they're supposed to help you discover who you are. -- Bernice Johnson Reagon