While I am not a Louisiana attorney, I suspect that you need to go to court to domesticate the Washington guardianship. Just as you had to file reports to the Washington State court, you will now have to report to the Louisiana court. I do not know how much it costs, but you may be able to file a poverty petition or receive assistance from your local legal aide organization.
Unless you came into my office, signed a contract and wrote me a check, I am not your attorney, and you are not my client. This is not intended as legal advice and should only be used for informational purposes only. You should never believe any information that you receive on the internet, especially information that is probably being provided in the late evening hours when I should be sleeping.