You may have already located Mary Francis Noblin and family since your post in 2008.
If not, you can find her family on the 1910 Federal Census of Missouri in Mountain Grove Township, Wright County.Her father Marion Francis Noblin was b. 1861 Arkansas and her mother May M. Noblin was born 1882 Missouri.They and seven children, including Mary Francis bca 1908 were all born in Missouri.
The Mary Frances Noblin found 1920 Census in the Itasca Orphans’ Home, Hill County, Texas may be the same child found in 1910 Missouri, but that remains to be confirmed. A great deal of background information on extended Noblin families was found by Goggling Marion Francis Noblin.Also, see 1920 Missouri Census.