Margret Wilson Backenstoe Reed

Survived, the Reeds were one of only two families to survive without loss.

Of the 83 members of the Donner Party who were trapped in the mountains, only 45 survived to reach California.

http://en.wikipedia.org/wiki/James_F._Reed

He married Margret Keyes Backenstoe, a widow with a baby daughter, in 1835. The couple had four more children in Springfield: Martha Jane (called Patty), James F. Reed, Jr., Thomas Keyes, and Gershom Francis, who died as an infant. Reed never formally adopted Margret Reed's eldest daughter, Virginia Elizabeth Backenstoe, but she went by the name Virginia Reed.[2]

http://en.wikipedia.org/wiki/Donner_Party

Margret Wilson Keyes Reed
BIRTH
31 Mar 1814
Union, Monroe County, West Virginia, USA
DEATH
25 Nov 1861 (aged 47)
San Jose, Santa Clara County, California, USA
BURIAL
Oak Hill Memorial Park
San Jose, Santa Clara County, California

https://www.findagrave.com/memorial/10951090/margret-wilson-reed