I am holding a judgment against my tenant. She made two payments then filed a motion to terminate the payment plan due to job loss. The judge denied her motion to terminate the payment plan. So the payment plan is still valid. Suddenly I got a check for an odd amount but most of the balance. She still owes about $150 on the original balance and another $200 in interest.
 
There was no letter with the check, and the only note/memo on the check is her name on the memo line (its a bank check, not a personal check). This exactly what she did with her prior payments. It seems I can cash this check (after copying both sides) and she still owes the balance. If she later claims this current check was accord and satisfaction, I would have the check copy to prove no such thing written on it but it would be her word against mine that no letter was enclosed. I intend to cash the check, but is there anything I can do to protect my right to the balance? E.g. on the back write "partial payment" and sign under that. Anything else? Thank you