Ms Mills-Westley had retired some years ago, her family said
The British woman stabbed and beheaded in a shop on the Spanish island of Tenerife has been named by her family as 60-year-old Jennifer Mills-Westley.
Her daughter Sarah said she was "full of life, generous of heart and would do anything for anyone".She said her mother was enjoying her retirement, travelling between Tenerife and France and visiting her other daughter in Norfolk.
Spanish media said a Bulgarian man, 28, was arrested in Los Cristianos.
Witnesses said a man entered a Chinese supermarket in a shopping centre and stabbed then beheaded her, before dropping the head outside.
He appeared to choose his victim at random, according to a local official.
Ms Mills-Westley's daughter Sarah said: "Mum retired a number of years ago and was fully enjoying her retirement traveling between Tenerife and France where she spent time visiting her daughter and grandchildren, and her other daughter in Norfolk.
"She was full of life, generous of heart, would do anything for anyone.
"We now have to find a way of living without her love and light and we would ask at this difficult time for some privacy as we try to come to terms with our loss."
'Incredibly well-respected'
Leader of the council Derrick Murphy said the news was "absolutely devastating" for those who used to work with her.
"We offer our sincere and deepest sympathies to Jenny's friends and family, in particularly her two daughters and five grandchildren," he said.
"As you can imagine, the terrible news obviously has come as a great shock to us... she was an incredibly well-respected member of the staff."
Ms Mills-Westley's former neighbour, Stella Watts, said she was a "kind, lovely lady" who used to take her to hospital to visit her sick partner.
Local officials have been analysing CCTV footage of the attack which shows a man walking into the supermarket - which sells Chinese food and tourist souvenirs.
Witnesses said the man attacked the woman without saying a word.
"Apparently this gentleman without any motive or any reason... entered the shop and then cut this woman's neck and took the head in his hand outside," said local councillor Manuel Reveron.
A security guard then managed to wrestle the man to the ground, he said.
"I parked my car and saw a man running out with something bloody in his hands and a security guard chasing him," one witness was quoted as telling local radio.
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