The quick answer is get help. If your community has a crisis number, call it. If they don’t, or if you don’t get the immediate response you need from your crisis center, call 911.
In the midst of a crisis it’s helpful to think of things in the simplest manner possible. Perhaps the most important question to ask to get through the worst of things is, “does this person need to be in a secure environment to maintain her safety or the safety of someone else?” If the answer is “yes,” then you’re likely looking at an inpatient hospitalization to stabilize the situation.
The reason for this somewhat cool approach has to do with the intense emotions that are typical in the midst of a crisis. The person with bipolar disorder may be saying everything possible to avoid being admitted, but if there’s evidence to support the fact, for example, that she’s been actively planning her suicide and has assembled the means to accomplish it, getting her into a safe setting may save her life.