Other than the name, I really don't have any info on Susannah, but my file shows the following: 1. James Marion Pribble b 21 Sep 1826 Monroe Co. OH d 24 Nov 1924 Vermilion IL(son of Thomas Pribble and Deborah Dickerson) m Catherine Yoho (2nd wife and daughter of Charles Yoho and Anna Brown) on 4 May 1861 Vermilion IL Catherine b 4 Dec 1837 Vermilion IL d 14 Nov 1917 Vermilion IL 2.Richard Marion Pribble b abt 20 Feb 1862 2.John Andrew Pribble b 1864 2.Robert Anderson Pribble b 1865 2.Ellen Pribble b 6 Sep 1867 2.Rachel Pribble b abt 1871 2.Justin Pribbble b 6 Dec 1878 2.Bert Pribble b 1 Mar 1882
1.James Pribble m Susannah Haines (1st wife) 2.Deborah Virginia Pribble b 3 Jun 1856
Although I don't have Mary and Flora in my file, I agree with your assumption they are also children of Susannah because according to the census they were born before the marriage date of James and Catherine Yoho.
I do have a continuation of the families of most of Catherine's children, and also for Debora who evidently married Jacob Brown Yoho son of Charles Yoho and Anna Brown, which results in a very complex set of relationships.