Looking for Amanda Green born 1824 or 1827 in Warren County, New Jersey

My brick wall is my gggrandmother AMANDA GREEN born 1824 in Warren county, New Jersey. Married to William Wornstaff (Warnstaff) on 24 November 1844 in Louisa County, Iowa. Moved to Oregon sometime around 1855 and then to Washington around 1887. Rumor has it that she's buried in Ione, Oregon but I haven't been able to confirm that. I need her parents names and the names of any siblings. Also if she really is buried in Oregon. Any help would be appreciated.