There are several with the Cubberly/Cubberley surname on this obituary listing, including Albert, and a child, Emma, but no Laura. See:
http://www.trentonhistory.org/Obit/Index1883-1889a-g.htmlI found a listing for Albert S. "Cubbarley", d. 21 Aug 1889, age 39, but none for Laura under either surname in Trenton papers, through a subscription site. I then searched just for the first name of Laura, and year of 1887. Got 6 hits, none with the info you provided. This was also for Trenton.
Some cemetery listings are on this page:
http://www.trentonhistory.org/Cemetery.htmlSorry I couldn't be of more help.
Dawn