Hi there
Patricia Constance Burrowes married in 1953 to John Tolan. It seems from Christchurch City Council Cemetery records
http://librarydata.christchurch.org.nz/Cemeteries/interment....= that she was buried at Belfast Cemetery in 1999.
Hope this information is of assistance. I live in Christchurch and the library in town is indeed still closed.
Regards
Jenny