I am a little confused as to what you are asking and what you think the proper process is for collecting the final payment.  It seems that you are relying on a law that is specific to your state and it appears would circumvent the probate process.  So I am a bit leery as to giving guidance here.  Generally speaking, you have a debt that it payable from the estate of the decedent.  You need to make a claim to the estate sooner rather than later.  You should really send a formal letter to the attorney for the estate and to the executrix (which is I assume her daughter).  And she is correct that the POA  died with her Mother so she could not pay you. Once the estate is given notice of the debt then you should receive notice of all the goings on.  Good luck.