Comments:

All that the US Department of Veteran's Affairs Nationwide Gravesite Locator records for Hart is that she was the "daughter (minor child) of Hart, Emma J."  According to notes from records in the National Archives, the mother may have been a laundress with Company L of the 1st United States Cavalry regiment.  Originally created as the "Regiment of Dragoons" in 1833 (later the 1st Dragoons), the regiment was redesignated as cavalry early in the Civil War.  After the war the regiment was sent west, arriving in San Francisco in January of 1866.

Although a position of low social standing, doing soldier's laundry was the only job a woman could normally hold in the19th century US Army (female nurses were a phenomenon of the Civil War and they often served in an unofficial capacity).  Each company's commander was allowed to appoint four women to do the soldiers' laundry.  Laundresses were entitled to quarters, food rations and transportation with the unit.  They charged the men for the laundry the did and were present on pay days to make sure the soldiers' debts to them were reckoned.  These women were subject to military discipline and, as they were the only women whose travel expenses were provided by the government, were often married to enlisted men in the company they served with. A post's laundress' quarters were often dubbed "sud's row."