Marie Livingstone is an Acadian fiddler from PEI, sister of fiddler Edward Arsenault and married to Orrin Livingstone (that's her sitting second from the left). In addition to being a great fiddler, she is also a prolific composer of tunes, many of which are featured in Les Faiseux de Tounes an Acadian fiddle tune book with 148 new tunes, plus photos and biographies of the 34 composers.
Here's a recording of Marie Livingstone playing her composition, Eddy and Amand reel at a slow teaching speed.
Marie Livingstone's Hermine Gallant reel is also played by Pascal Miousse with Vishtèn. See post on Pascale for his version.