The best course of action would be to hire an attorney to start guardianship proceedings as soon as possible. Due to your daughter's condition and youth, there is a good chance she will not be pleased by a guardianship and may try to contest it. This is why it is in both of your best interests to do it right the first time.
This posting is for informational purposes only. It is not legal advice, nor does it establish an attorney-client relationship. For more information, please visit www.justinelderlaw.com.
Guardianships take time. A guardian ad litem (GAL) is appointed by the court to write a report, and the GAL has to get a medical report for the judge to consider. Generally, guardianships take at least 45 days. Guardianships are disfavored. A power of attorney is often sufficient to avoid a guardianship. The person has a right to hire a lawyer and contest a guardianship in a jury trial, so one must initiate a guardianship carefully and thoughtfully. I suggest you consult with a guardianship attorney who can give you specific advice concerning this difficult situation.
One other thought: with bi-polar disease, your daughter may choose to have a mental health directive under RCW 71.32.
This information is intended as general information only, and does not establish an attorney-client relationship. Please seek particular advice from an attorney.