Ancestry only mentions Falkirk.
You need to check anything you find on Ancestry or other sites by looking up the original records, which often contain information not contained in Ancestry.
I found one on another site yesterday. It was a baptism in 1788 of someone born at a farm called Milfield in the parish of Guthrie, which is in the County of Angus, which used to be known as Forfarshire, or the County of Forfar. It was indexed on that site as "Milfield, Forfar" which is directly misleading because it might give someone the idea that this person was born in the town or parish of Forfar! Use online trees, transcriptions and so on as a pointer to hep find the original documents
As for Elizabeth Potter or Taylor, if that death had been hers she might have been described as Mrs Taylor, or conceivably (though unlikely) Miss Potter but hardly as Miss Taylor. So I doubt that this is in fact the person you are looking for.
If, as seems to be the case, she actually owned land and/or buildings, you need to consult the Register of Sasines. These are the records of changes of ownership of 'heritable property', i.e. land and buildings. They are in the National Records of Scotland in General Register House, Edinburgh but you would either need to go there in person, or get someone to go on your behalf.
The abridgments of sasines, which are summaries of the original rather long-winded documents, normally give the names of all parties involved in a transaction and of their relationships to one another. These have been digitised using an optical character recognition system, and the results are less than 100% satisfactory, but they certainly beat the alternative method, which was very tedious and time-consuming.
