I found Mary and her family in the 1920 Salmon, Lemhi, Idaho Census.
I found a Mary H. Abbott in the 1930 Census in Carmen, Lemhi Co., ID but she was single and I can't tell if she's your Mary.
I didn't find her in the marriage or death records.
There are two local volunteers who might be able to help you. Go to rootsweb.ancestry.com/~idlemhi/pages/lemhi_county_lookups.htm .
There is also the Lemhi County Historian at rootsweb.ancestry.com/~idlemhi/pages/Organizations/lemhi_county_resources.htm . Successful Searching