As far as I can tell, the only sisters of JMB who could possibly have remarried were: Mary and Isabella. If they had done so, Mary would have remarried having the name Mary Edward Galloway, while Isabella would have had the name Isabella Ogilvy Murray.
Here are the basic BMD-type details, insofar as I know them, of JMB and his siblings:
(K = Kirriemuir):
Alexander Ogilvy Barrie, born K about March 1842, died K July 16, 1914, married Edinburgh July 31, 1877, Mary Cowan (born February 6, 1856, died K February 19, 1928), had 9 children.
Mary Edward Barrie, born K about January 1845, died unknown, married August 13, 1879 John Galloway. (children?).
Jane Ann Adamson Barrie, born K March 14, 1847, died K August 31, 1895, did not marry.
Elizabeth How Barrie, born K March 12, 1849, died K April 2, 1851.
Agnes Matthew Barrie, born K December 23, 1850, died January 1851.
David Ogilvy Barrie, born K January 30, 1853, died Bothwell, Lanarkshire, January 29, 1867 (contrary to many accounts, David died of inflammation of the brain a week after fracturing his skull when he was knocked over and hit his head in an accident on the ice while watching his friend skating pond).
Sara Mitchell Barrie, born K June 3, 1854, died November 1, 1903. Did not marry. (Name was recorded as Sarah for the 1861 census).
Isabella Ogilvy Barrie, born K January 4, 1858, died 1902, married K December 2, 1880, to William Murray. (children?)
James Matthew Barrie, born K May 9, 1860, died London June 19, 1937, married K July 9, 1894, Mary Ansell (born Paddington, London, March 1, 1861, died as Mary Cannan at Biarritz, France, June 30, 1950). No children. Divorced London April 1910.
Margaret ('Maggie') Barrie, born K July 9, 1863, died 1936, married K 1893 Wiliam Henderson Winter (born Scotland about 1858, died after 1936), one child: William Winter (born Medstead, Hampshire, about November 1897, died about 1954).
Good luck with your searching. I should be very interested to learn how you get on.