Her sister was Bertha Karine (Pedersdatter) Strand, wife of Nels, also buried in Greenwood Cemetery. Andrea took the name Newhouse from her farm name "Nyhuus" in Norway when they immigrated in 1880.

Peder Olsen Nyhuus is the father and Maren Steffensdatter is the mother of  Andrea Pedersdatter Hanson  
Modum kirkebøker, F/Fa/L0003: Parish register (official) no. 3, 1783-1819, p. 212-213 […]
https://media.digitalarkivet.no/en/view/8496/111
Born and baptized 1798
Page 212
Peder
Born: Aug.30.1798 
Baptized: Sep.09.1798 in Nykirke, Modum, Buskerud, Norway
Parents: Ole Pedersen and Wife Berthe Erichsdatter
Residence: Buskeruedeie, Modum,Buskerud, Norway
SAKO, Modum kirkebøker, F/Fa/L0010: Parish register (official) no. 10, 1865-1876, p. 362
Quick link: https://www.digitalarkivet.no/kb20061101370537
Deceased and buried 1875
# 74
Peder Olsen Nyhuus, 77 years old.
Residence: Nyhuus, Modum, Buskerud, Norway
Died: Jun.14.1875
Buried: Jun.20.1875 in Nykirke, Modum, Buskerud, Norway
Cause of death: Stomach Cancer
Modum kirkebøker, F/Fa/L0003: Parish register (official) no. 3, 1783-1819, p. 426-427 […]
https://media.digitalarkivet.no/en/view/8496/218
Born and baptized 1815
Page 427
Maren
Born: May.17.1815 in Rypaas, Modum, Buskerud, Norway
Baptized: May.28.1815 in Nykirke, Modum, Buskerud, Norway
Parents: Stephend Corneliusen and wife Berthe Hansdatter.
Residence: Buskerud eie, Modum, Buskerud, Norway

Modum kirkebøker, F/Fa/L0016: Parish register (official) no. 16, 1890-1899, p. 95 […]
https://media.digitalarkivet.no/en/view/1198/76
Deceased and buried 1894
# 3
Widow Maren Steffensdatter, born 1815 in Modum.
Residence: Nyhus, Modum, Buskerud, Norway
Died: Mar.10.1894 
Funeral: Mar. 20.1894 in Nykirke, Modum, Buskerud, Norway
Buried: Mar.22.1894 in Nykirke, Modum,Buskerud, Norway
Cause of Death: Heart Failure