In the 1850 Federal Census, Ruth Osborne is age 55 and living at Tiverton, RI. In the household are: Henry 26, Benjamin 25, & Thomas 21, all Osborne; also Maria Hambly, 3.
At this point her name was really Ruth O. Westgate, the middle initial meaning Osborn.
Ruth remarried to William Westgate sometime before 13 Jan 1846 when she is mentioned as "Ruth Westgate who before her marriage was Ruth Osborn," in the Will of Weston Hicks.
The will of Ruth O. Westgate of Tiverton is dated 3 Aug 1852, proved 3 Jan 1853. It mentions four children: William H., Benjamin H., & Thomas D. Osborn; and Elizabeth A. Hambly.