Oklahoma MIPT (Medicaid Income Pension Trust) - Dissolving timeline

My mother passed 2 years ago, I'm in Oklahoma and I've contacted the Oklahoma HealthCare Authority multiple times trying to dissolve the MIPT. How long do they have to request the funds of the MIPT - is there a Statute of Limitations they have to request reimbursement from the Trust? There was no estate, etc. I'd like to get this final matter resolved and closed.