I searched Ancestry and FamilySearch and didn't find Sarah's parents and siblings. I also searched the Census records hoping that one of them lived with Sarah and Almon but no such luck.
If the Informant at the time of her death knew, the parents will appear on her death certificate. You can order a copy from the Latah County Clerk/Auditor/Recorder's Office, www.latah.id.us/clerk/
They might be mentioned in her obituary. There are two obituary volunteers at freepages.genealogy.rootsweb.ancestry.com/~obitl/volid.html
Scroll down to Latah Co.
Choose ONE volunteer at a time.
The name of her parents MIGHT be on her marriage certificate which is filed in the marriage book at the Nez Perce Co. Courthouse in Vol. E on page. 19.
To contact the Nez Perce County Clerk, www.co.nezperce.id/us
I also found the Woodward Family Tree, trees.ancestry.com/tree/26191875/person/12063917124 . Most larger libraries provide free access to Ancestry. It does contain Sarah, Almon and their children but her parents aren't listed. I thought you might want to contact the owner. Successful Searching!