was Hannahs father John a Dockmaster ??  could this be her marriage ?
Marriage: 20 Sep 1869 Holy Trinity, Liverpool, Lancashire, England
 Robert Gornall - Full, Coach Builder, Bachelor, 11 Canterbury Street
 Hannah Grundy - (X), Full, Spinster, 20 Pitt Street
     Groom's Father: Robert Gornall, Gentleman
     Bride's Father: John Grundy, Dock Master
     Witness: Thomas Pearson, (X); Hannah Pearson, (X)
     Married by Banns by: Gustavus Carson A. K. A. Off. Min. Off.Minister
     Register: Marriages 1863 - 1874, Page 154, Entry 307
     Source: LDS Film 1656017
if it is - looks like she married in to money - her father in law is a "Gentleman " 
