Sarah was the daughter of Samuel Allen and Sarah (Partridge) Allen. She was born in Bridgewater, Plymouth Colony.
Sarah married Jonathan Cary. She became a widow upon his death in 1695. Sarah settled Jonathan's estate in 1695. They had children:
Recompence - about 1688
John - about 1690
Jonathan - about 1692
Sarah married Benjamin Snow on 25 October 1705 in Bridgewater, Plymouth county, Province of Massachusetts Bay. They had a child:
Sarah - 20 August 1706
Sarah and Jonathan Cary's children, in 1706, chose their uncle Samuel Allen, to be their guardian.
It is not known when or where Sarah died.