Thank you both for your posts.
Lynna Brown married Frank M. Brown 20 Jan 1900 in Joplin Missouri. He did not stay in the picture for very long and disappeared after the 1900 census and although I have found a lot of Frank M. Browns, I cant be sure it is him. Louise was apparently found on their doorstep in Joplin, MO - I do not think that is true. Lynna Brown (nee: Tomlinson) was in the Swift Current and Cantuar region sometime between 1909 and 1914 during which time she married Alex Clark.(I have not found any evidence of marriage but she mentions Alex Clark as Louises stepfather when she crosses the border to the U.S. July 1917. The name Alex Hush also from the Cantuar area is mentioned on her border crossings as well.