The decision not to shut down the UK to slow the spread of infection is described as one of the country's biggest public health mistakes to date in a 150-page report.
Linsey Jackson's mother is one of the 138,000 Britons who have died so far with covid-19.
She now wants to see a more comprehensive investigation so that the same mistake is not made in the future.
- This is not a game, my mother did not lose her life in a game.
"I think she died because of the mistakes that the government made, and I want to clarify that through a full-scale legal investigation," said Linsey Jackson.
The report also highlighted positive measures.
The country's vaccination strategy, with its development and distribution, is described as one of the greatest successes of all time.