What are my rights as seller when a contract for deed has expired and the loan balance has not been paid?

Question Details: I, as POA for my now 101 year old mother, entered into a contract for deed on her home and land 5 1/2 years ago, with a maturity date of 12 months later, "when the full amount of the Original Principal Balance plus interest will be due and payable". This document was executed and filed of record. No extensions or amendments to the contract have been accepted by the buyer nor filed of record. I order for me to receive aid for my mother and also to pay for her constant care the buyer needs to secure their own loan and pay the principal plus interest and taxes by the end of the year. What are my right as the POA/Seller? Can I call the note and/or evict them and sue for breach of contract, damages and attorney's fees? Realizing the contract has matured, do I have any rights at all?

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