Just looked in the Philly directories:
1855:
Pollock, Sarah, 106 Penn
1858:
Pollock, Sarah A., 2 Penn (K) [Kensington]
1859:
Pollock, Sarah Ann, 1043 Penn
1860:
Pollock, Sarah A, wid William, 1043 N [North] Del Av
1861:
Pollock, Sarah Ann, widow r Hancock n[near] Jefferson
There are more entries for a Sarah, but she is the widow of Thomas.