"She befriended many travellers, immigrants and refugees opening her home, her heart and her kitchen," he said.
Armstrong loved sharing New Zealand with foreign arrivals, taking them to parts of the country they might never see otherwise and helping them to settle into their new home.
"She moved to Christchurch in recent years to be closer to her daughter and grandchildren - who at this time ask for space and to be left alone whilst they grieve."
Gosse and his brother have flown down to Christchurch to support their family.