I have no idea if this is actually true, of course, but if you Google around you can find the same info I found. This old woman was the grandmother of two early filmmakers who were born in the 1870's and 1880's, Yanaki and Milton Manaki. They lived in the Ottoman Empire, in an area that is Macedonia today. Here, this is their grandmother weaving. Even if she wasn't born in 1791, she couldn't have been born later than the early 19th century.
This is about the Manaki brothers:
https://en.wikipedia.org/wiki/Yanaki_and_Milton_Manaki
If you come up with any unusual search strategy that turns up some cool info, please share it!