Mo. Rev. Stat. § 452.314

Notwithstanding any other provision of law to the contrary, a guardian for an incapacitated person may file a petition for dissolution of the marriage of, or if the incapacitated person has a history of religious objection to divorce, the guardian may file for a legal separation for such incapacitated person and may give testimony in support of the allegations contained in the petition, if the guardian has reasonable cause to believe that the incapacitated person has been the victim of abuse by the spouse of such incapacitated person.