Sometime after 1900 Susan appears to have been hospitalized in that Joseph Weaver is without Suan in the 1910 census and a Susan Weaver can be found in the Pennsylvania State Hospital: The 190 Federal Census for Norristown, Ward 6, Montgomery Co., PA, District 120, Pennsylvania State Hospital for Insane, SE District, page 194B, dated May 7, 1910 records Susan Weaver (46 - PA/US/US) as an Inmate. She is married since the age of 18 and has had 9 children of whom 4 are still living. These numbers seem to be consistent with the 1900 census facts ... see general notes on her husband, Joseph D. Weaver.
Susan married Joseph D. Weaver on 10 Dec 1883 in Kosciusko Co., Indiana. (Joseph D. Weaver was born on 9 Dec 1840 in Ohio, died on 17 Nov 1916 in Bremen, Marshall Co., Indiana and was buried in Bremen Municipal Cemetery, Bremen, Marshall Co., Indiana.)
Indiana, Marriage Collection, 1800-1941 <http://www.ancestry.com>